Re: [gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-19 Thread parichita parichita

Thaks for your suggesion... 
 
I want to use Gromacs for MD on my disaccharides in explicit water box.Now, the 
problem I encounter is that the pdb2gmx produces the topologies where hydrogens 
sitting on carbons are condensed on carbon atoms they sit on. I need them 
explicitly 
since I would like to study the NMR coupling contanst of hydroxy protons and 
C-H protons.I 
mean 3J(H-O-C-H) and measure the distance between the C-H proton through the 
glycosidic linkage. 
So my questions are;

1- Are the force fields(45a3,53a5) that are implemented in Gromacs capable of 
taking care 
of hydrogens sitting on carbon atoms in a sugar molecule explicitly?

2- How can I most reliably produce topologies for my disaccharide that will 
be placed in a water box to perform MD?


I am quite new to MD methods therefore I apologize already now if I put 
forward something incoherent.

Thanks for the help,
 

Tsjerk Wassenaar <[EMAIL PROTECTED]> wrote: Parichita,

My guess is you only thought to have 1-6 linkage, because the atoms
seemed so nicely involved in the .pdb file. But you'll have to define
a bond explicitly or it won't be there to break in the first place. I
think you need to read up on topologies, force fields and general
background about simulating molecular systems. Chapter 5 is a must. If
you continue on this path, note that sugar dihedrals, especially the
ones connecting the rings, are complex. Check out Roberto Lins' paper
on the 45a3 force field.

Tsjerk

On 9/17/07, Mark Abraham  wrote:
> parichita parichita wrote:
> > Hi again.
> >   Thank you for your help
> >  I found my MANA in the ffG53a5.rtp and i can prepare
> > the .gro and .top file from pdb2gmx.
> > Now , i am facing another problem after solvation of
> > my solute when i run the minimization the 1-6 linkage
> > was broken ..
> > please help me out 
>
> "linkage was broken" doesn't help us help you. Please describe in detail
> what you observed and why you think it was wrong.
>
> Mark
> ___
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-- 
Tsjerk A. Wassenaar, Ph.D.
Junior UD (post-doc)
Biomolecular NMR, Bijvoet Center
Utrecht University
Padualaan 8
3584 CH Utrecht
The Netherlands
P: +31-30-2539931
F: +31-30-2537623
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Parichita Mazumder 
Junior Research Fellow 
C/O Dr. Chaitali Mukhopadhayay 
Department of Chemistry 
University of Calcutta 
92,A P C Road 
Kolkata-79 
India.


   
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Re: [gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-19 Thread Mark Abraham

parichita parichita wrote:
Thaks for your suggesion... 
 
I want to use Gromacs for MD on my disaccharides in explicit water box.Now, the 
problem I encounter is that the pdb2gmx produces the topologies where hydrogens 
sitting on carbons are condensed on carbon atoms they sit on. I need them explicitly 
since I would like to study the NMR coupling contanst of hydroxy protons and C-H protons.I 
mean 3J(H-O-C-H) and measure the distance between the C-H proton through the glycosidic linkage. 
So my questions are;


1- Are the force fields(45a3,53a5) that are implemented in Gromacs capable of taking care 
of hydrogens sitting on carbon atoms in a sugar molecule explicitly?


See below, and http://wiki.gromacs.org/index.php/Force_Fields

2- How can I most reliably produce topologies for my disaccharide that will 
be placed in a water box to perform MD?


pdb2gmx... you should find and do some tutorial material to learn about 
this.


I am quite new to MD methods therefore I apologize already now if I put 
forward something incoherent.


You should definitely be doing some background reading of textbooks and 
tutorials if you haven't yet come across the phenomena of united-atom 
and all-atom force fields. MD simulations are fabulously easy ways to 
generate very expensive random numbers, and there's no substitute for 
library work and careful experimentation. The first few chapters of the 
GROMACS manual are a good place to start.


Mark
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Re: [gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-17 Thread Tsjerk Wassenaar
Parichita,

My guess is you only thought to have 1-6 linkage, because the atoms
seemed so nicely involved in the .pdb file. But you'll have to define
a bond explicitly or it won't be there to break in the first place. I
think you need to read up on topologies, force fields and general
background about simulating molecular systems. Chapter 5 is a must. If
you continue on this path, note that sugar dihedrals, especially the
ones connecting the rings, are complex. Check out Roberto Lins' paper
on the 45a3 force field.

Tsjerk

On 9/17/07, Mark Abraham <[EMAIL PROTECTED]> wrote:
> parichita parichita wrote:
> > Hi again.
> >   Thank you for your help
> >  I found my MANA in the ffG53a5.rtp and i can prepare
> > the .gro and .top file from pdb2gmx.
> > Now , i am facing another problem after solvation of
> > my solute when i run the minimization the 1-6 linkage
> > was broken ..
> > please help me out 
>
> "linkage was broken" doesn't help us help you. Please describe in detail
> what you observed and why you think it was wrong.
>
> Mark
> ___
> gmx-users mailing listgmx-users@gromacs.org
> http://www.gromacs.org/mailman/listinfo/gmx-users
> Please search the archive at http://www.gromacs.org/search before posting!
> Please don't post (un)subscribe requests to the list. Use the
> www interface or send it to [EMAIL PROTECTED]
> Can't post? Read http://www.gromacs.org/mailing_lists/users.php
>


-- 
Tsjerk A. Wassenaar, Ph.D.
Junior UD (post-doc)
Biomolecular NMR, Bijvoet Center
Utrecht University
Padualaan 8
3584 CH Utrecht
The Netherlands
P: +31-30-2539931
F: +31-30-2537623
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Re: [gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-17 Thread Mark Abraham

parichita parichita wrote:

Hi again.
  Thank you for your help
 I found my MANA in the ffG53a5.rtp and i can prepare
the .gro and .top file from pdb2gmx.
Now , i am facing another problem after solvation of
my solute when i run the minimization the 1-6 linkage
was broken ..
please help me out 


"linkage was broken" doesn't help us help you. Please describe in detail 
what you observed and why you think it was wrong.


Mark
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Re: [gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-17 Thread parichita parichita
Hi again.
  Thank you for your help
 I found my MANA in the ffG53a5.rtp and i can prepare
the .gro and .top file from pdb2gmx.
Now , i am facing another problem after solvation of
my solute when i run the minimization the 1-6 linkage
was broken ..
please help me out 
 thanks in advance!
   parichita.





--- TJ Piggot <[EMAIL PROTECTED]> wrote:

> Just a quick look at the ffG45a3.rtp shows that
> there is an entry for ADE, 
> however the ADE entry is for Adenine.
> 
> For help with your problem check out:
> 
>
http://wiki.gromacs.org/index.php/Errors#Residue_.27XXX.27_not_found_in_residue_topology_database
> 
> Tom
> 
> --On Friday, September 14, 2007 14:13:55 +0100
> parichita parichita 
> <[EMAIL PROTECTED]> wrote:
> 
> > Hi,
> >
> >  I have facing some problem when converting
> .pdb file to .gro and
> > .top .
> >  I have a .pdb of alpha d-mannose (1-6) alpha
> d-mannose. I was using the
> > pdb2gmx command and 45a3 forcefield .
> >  Showing the fatal error:
> >  Atom O in residue ADE 1 not found in rtp entry
> with 25 atoms
> >   while sorting atoms
> >  and
> > Warning: 'ADMA' not found in residue topology
> database, trying to use
> > 'ADE'
> >  Warning: 'ADMA' not found in residue topology
> database, trying to use
> > 'ADE
> >
> >
> > but in  ffG45a3.rtp I could not found any ADE
> ...
> >  so I was confused ...
> >  Please give me some suggession.
> >  The format of my M6M.pdb is,
> >
> > ATOM  1  C5  ADMA1   3.337   1.774 
> -8.944  1.00  0.00
> > C
> >  ATOM  2  O   ADMA1   4.702   1.679 
> -8.463  1.00  0.00
> > O
> >  ATOM  3  C1  ADMA1   5.227   0.338 
> -8.248  1.00  0.00
> > C
> >  ATOM  4  C2  ADMA1   4.345  -0.412 
> -7.222  1.00  0.00
> > C
> >  ATOM  5  O2  ADMA1   4.481   0.211 
> -5.965  1.00  0.00
> > O
> >  ATOM  6  C3  ADMA1   2.854  -0.372 
> -7.633  1.00  0.00
> > C
> >  ATOM  7  O3  ADMA1   2.063  -0.925 
> -6.611  1.00  0.00
> > O
> >  ATOM  8  C4  ADMA1   2.367   1.065 
> -7.950  1.00  0.00
> > C
> >  ATOM  9  O4  ADMA1   1.062   1.009 
> -8.476  1.00  0.00
> > O
> >  ATOM 10  C6  ADMA1   3.018   3.281 
> -9.160  1.00  0.00
> > C
> >  ATOM 11  O6  ADMA1   1.778   3.456 
> -9.811  1.00  0.00
> > O
> >  ATOM 12  H5  ADMA1   3.271   1.274 
> -9.929  1.00  0.00
> > H
> >  ATOM 13  H1  ADMA1   6.262   0.415 
> -7.876  1.00  0.00
> > H
> >  ATOM 14  H2  ADMA1   4.685  -1.464 
> -7.133  1.00  0.00
> > H
> >  ATOM 15  HO2 ADMA1   5.425   0.166 
> -5.725  1.00  0.00
> > H
> >  ATOM 16  H3  ADMA1   2.727  -0.987 
> -8.546  1.00  0.00
> > H
> >  ATOM 17  HO3 ADMA1   1.139  -0.907 
> -6.925  1.00  0.00
> > H
> >  ATOM 18  H4  ADMA1   2.343   1.645 
> -7.006  1.00  0.00
> > H
> >  ATOM 19  HO4 ADMA1   0.779   1.926 
> -8.640  1.00  0.00
> > H
> >  ATOM 20 1H6  ADMA1   3.805   3.735 
> -9.772  1.00  0.00
> > H
> >  ATOM 21 2H6  ADMA1   3.014   3.809 
> -8.202  1.00  0.00
> > H
> >  ATOM 22  H6  ADMA1   1.654   4.401 
> -9.918  1.00  0.00
> > H
> >  ATOM 23  C5  ADMA1B  5.806  -2.519
> -10.516  1.00  0.00
> > C
> >  ATOM 24  O   ADMA1B  6.529  -3.735
> -10.196  1.00  0.00
> > O
> >  ATOM 25  C1  ADMA1B  6.753  -4.668
> -11.291  1.00  0.00
> > C
> >  ATOM 26  O1  ADMA1B  7.522  -4.046
> -12.268  1.00  0.00
> > O
> >  ATOM 27  C2  ADMA1B  5.398  -5.107
> -11.893  1.00  0.00
> > C
> >  ATOM 28  O2  ADMA1B  4.700  -5.870
> -10.935  1.00  0.00
> > O
> >  ATOM 29  C3  ADMA1B  4.533  -3.881
> -12.271  1.00  0.00
> > C
> >  ATOM 30  O3  ADMA1B  3.254  -4.305
> -12.671  1.00  0.00
> > O
> >  ATOM 31  C4  ADMA1B  4.406  -2.866
> -11.106  1.00  0.00
> > C
> >  ATOM 32  O4  ADMA1B  3.754  -1.706
> -11.569  1.00  0.00
> > O
> >  ATOM 33  C6  ADMA1B  5.743  -1.655 
> -9.224  1.00  0.00
> > C
> >  ATOM 34  O6  ADMA1B  5.227  -0.368 
> -9.490  1.00  0.00
> > O
> >  ATOM 35  H5  ADMA1B  6.383  -1.951
> -11.270  1.00  0.00
> > H
> >  ATOM 36  H1  ADMA1B  7.300  -5.545
> -10.905  1.00  0.00
> > H
> >  ATOM 37  HO1 ADMA1B  7.013  -3.281
> -12.602  1.00  0.00
> > H
> >  ATOM 38  H2  ADMA1B  5.572  -5.738
> -12.788  1.00  0.00
> > H
> >  ATOM 39  HO2 ADMA1B  5.261  -6.638
> -10.719  1.00  0.00
> > H
> >  ATOM 40  H3  ADMA1B  5.014  -3.365
> -13.126  1.00  0.00
> > H
> >  ATOM 41  HO3 ADMA1B  2.756  -3.507
> -12.928  1.00  0.00
> > H
> >  ATOM 42  H4  ADMA1B  3.788  -3.323
> -10.307  1.00  0.00
> > H
> >  ATOM 43  HO4 ADMA1B  3.668  -1.103
> -10.809  1.00  0.00
> > H
> >  ATOM 44 1H6  ADMA1B  6.749  -1.553 
> -8.805  1.00  0.00
> > 

Re: [gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-14 Thread TJ Piggot
Just a quick look at the ffG45a3.rtp shows that there is an entry for ADE, 
however the ADE entry is for Adenine.


For help with your problem check out:

http://wiki.gromacs.org/index.php/Errors#Residue_.27XXX.27_not_found_in_residue_topology_database

Tom

--On Friday, September 14, 2007 14:13:55 +0100 parichita parichita 
<[EMAIL PROTECTED]> wrote:



Hi,

 I have facing some problem when converting .pdb file to .gro and
.top .
 I have a .pdb of alpha d-mannose (1-6) alpha d-mannose. I was using the
pdb2gmx command and 45a3 forcefield .
 Showing the fatal error:
 Atom O in residue ADE 1 not found in rtp entry with 25 atoms
  while sorting atoms
 and
Warning: 'ADMA' not found in residue topology database, trying to use
'ADE'
 Warning: 'ADMA' not found in residue topology database, trying to use
'ADE


but in  ffG45a3.rtp I could not found any ADE ...
 so I was confused ...
 Please give me some suggession.
 The format of my M6M.pdb is,

ATOM  1  C5  ADMA1   3.337   1.774  -8.944  1.00  0.00
C
 ATOM  2  O   ADMA1   4.702   1.679  -8.463  1.00  0.00
O
 ATOM  3  C1  ADMA1   5.227   0.338  -8.248  1.00  0.00
C
 ATOM  4  C2  ADMA1   4.345  -0.412  -7.222  1.00  0.00
C
 ATOM  5  O2  ADMA1   4.481   0.211  -5.965  1.00  0.00
O
 ATOM  6  C3  ADMA1   2.854  -0.372  -7.633  1.00  0.00
C
 ATOM  7  O3  ADMA1   2.063  -0.925  -6.611  1.00  0.00
O
 ATOM  8  C4  ADMA1   2.367   1.065  -7.950  1.00  0.00
C
 ATOM  9  O4  ADMA1   1.062   1.009  -8.476  1.00  0.00
O
 ATOM 10  C6  ADMA1   3.018   3.281  -9.160  1.00  0.00
C
 ATOM 11  O6  ADMA1   1.778   3.456  -9.811  1.00  0.00
O
 ATOM 12  H5  ADMA1   3.271   1.274  -9.929  1.00  0.00
H
 ATOM 13  H1  ADMA1   6.262   0.415  -7.876  1.00  0.00
H
 ATOM 14  H2  ADMA1   4.685  -1.464  -7.133  1.00  0.00
H
 ATOM 15  HO2 ADMA1   5.425   0.166  -5.725  1.00  0.00
H
 ATOM 16  H3  ADMA1   2.727  -0.987  -8.546  1.00  0.00
H
 ATOM 17  HO3 ADMA1   1.139  -0.907  -6.925  1.00  0.00
H
 ATOM 18  H4  ADMA1   2.343   1.645  -7.006  1.00  0.00
H
 ATOM 19  HO4 ADMA1   0.779   1.926  -8.640  1.00  0.00
H
 ATOM 20 1H6  ADMA1   3.805   3.735  -9.772  1.00  0.00
H
 ATOM 21 2H6  ADMA1   3.014   3.809  -8.202  1.00  0.00
H
 ATOM 22  H6  ADMA1   1.654   4.401  -9.918  1.00  0.00
H
 ATOM 23  C5  ADMA1B  5.806  -2.519 -10.516  1.00  0.00
C
 ATOM 24  O   ADMA1B  6.529  -3.735 -10.196  1.00  0.00
O
 ATOM 25  C1  ADMA1B  6.753  -4.668 -11.291  1.00  0.00
C
 ATOM 26  O1  ADMA1B  7.522  -4.046 -12.268  1.00  0.00
O
 ATOM 27  C2  ADMA1B  5.398  -5.107 -11.893  1.00  0.00
C
 ATOM 28  O2  ADMA1B  4.700  -5.870 -10.935  1.00  0.00
O
 ATOM 29  C3  ADMA1B  4.533  -3.881 -12.271  1.00  0.00
C
 ATOM 30  O3  ADMA1B  3.254  -4.305 -12.671  1.00  0.00
O
 ATOM 31  C4  ADMA1B  4.406  -2.866 -11.106  1.00  0.00
C
 ATOM 32  O4  ADMA1B  3.754  -1.706 -11.569  1.00  0.00
O
 ATOM 33  C6  ADMA1B  5.743  -1.655  -9.224  1.00  0.00
C
 ATOM 34  O6  ADMA1B  5.227  -0.368  -9.490  1.00  0.00
O
 ATOM 35  H5  ADMA1B  6.383  -1.951 -11.270  1.00  0.00
H
 ATOM 36  H1  ADMA1B  7.300  -5.545 -10.905  1.00  0.00
H
 ATOM 37  HO1 ADMA1B  7.013  -3.281 -12.602  1.00  0.00
H
 ATOM 38  H2  ADMA1B  5.572  -5.738 -12.788  1.00  0.00
H
 ATOM 39  HO2 ADMA1B  5.261  -6.638 -10.719  1.00  0.00
H
 ATOM 40  H3  ADMA1B  5.014  -3.365 -13.126  1.00  0.00
H
 ATOM 41  HO3 ADMA1B  2.756  -3.507 -12.928  1.00  0.00
H
 ATOM 42  H4  ADMA1B  3.788  -3.323 -10.307  1.00  0.00
H
 ATOM 43  HO4 ADMA1B  3.668  -1.103 -10.809  1.00  0.00
H
 ATOM 44 1H6  ADMA1B  6.749  -1.553  -8.805  1.00  0.00
H
 ATOM 45 2H6  ADMA1B  5.131  -2.153  -8.466  1.00  0.00
H
 TER


thanks in advance ..

parichita...









Parichita Mazumder
Junior Research Fellow
C/O Dr. Chaitali Mukhopadhayay
Department of Chemistry
University of Calcutta
92,A P C Road
Kolkata-79
India.


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--
TJ Piggot
[EMAIL PROTECTED]
University of Bristol, UK.

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[gmx-users] topology of Alpha d-mannopyranosyl (1-6) alpha d-mannopyranose

2007-09-14 Thread parichita parichita
Hi,
 
  I have facing some problem when converting .pdb file to .gro and .top .
 I have a .pdb of alpha d-mannose (1-6) alpha d-mannose. I was using the  
pdb2gmx command and 45a3 forcefield .
 Showing the fatal error:
 Atom O in residue ADE 1 not found in rtp entry with 25 atoms
  while sorting atoms
 and 
 Warning: 'ADMA' not found in residue topology database, trying to use 'ADE'
 Warning: 'ADMA' not found in residue topology database, trying to use 'ADE
  
 
 but in  ffG45a3.rtp I could not found any ADE ...
 so I was confused ...
 Please give me some suggession.
 The format of my M6M.pdb is,
 
 ATOM  1  C5  ADMA1   3.337   1.774  -8.944  1.00  0.00   C
 ATOM  2  O   ADMA1   4.702   1.679  -8.463  1.00  0.00   O
 ATOM  3  C1  ADMA1   5.227   0.338  -8.248  1.00  0.00   C
 ATOM  4  C2  ADMA1   4.345  -0.412  -7.222  1.00  0.00   C
 ATOM  5  O2  ADMA1   4.481   0.211  -5.965  1.00  0.00   O
 ATOM  6  C3  ADMA1   2.854  -0.372  -7.633  1.00  0.00   C
 ATOM  7  O3  ADMA1   2.063  -0.925  -6.611  1.00  0.00   O
 ATOM  8  C4  ADMA1   2.367   1.065  -7.950  1.00  0.00   C
 ATOM  9  O4  ADMA1   1.062   1.009  -8.476  1.00  0.00   O
 ATOM 10  C6  ADMA1   3.018   3.281  -9.160  1.00  0.00   C
 ATOM 11  O6  ADMA1   1.778   3.456  -9.811  1.00  0.00   O
 ATOM 12  H5  ADMA1   3.271   1.274  -9.929  1.00  0.00   H
 ATOM 13  H1  ADMA1   6.262   0.415  -7.876  1.00  0.00   H
 ATOM 14  H2  ADMA1   4.685  -1.464  -7.133  1.00  0.00   H
 ATOM 15  HO2 ADMA1   5.425   0.166  -5.725  1.00  0.00   H
 ATOM 16  H3  ADMA1   2.727  -0.987  -8.546  1.00  0.00   H
 ATOM 17  HO3 ADMA1   1.139  -0.907  -6.925  1.00  0.00   H
 ATOM 18  H4  ADMA1   2.343   1.645  -7.006  1.00  0.00   H
 ATOM 19  HO4 ADMA1   0.779   1.926  -8.640  1.00  0.00   H
 ATOM 20 1H6  ADMA1   3.805   3.735  -9.772  1.00  0.00   H
 ATOM 21 2H6  ADMA1   3.014   3.809  -8.202  1.00  0.00   H
 ATOM 22  H6  ADMA1   1.654   4.401  -9.918  1.00  0.00H
 ATOM 23  C5  ADMA1B  5.806  -2.519 -10.516  1.00  0.00   C
 ATOM 24  O   ADMA1B  6.529  -3.735 -10.196  1.00  0.00   O
 ATOM 25  C1  ADMA1B  6.753  -4.668 -11.291  1.00  0.00   C
 ATOM 26  O1  ADMA1B  7.522  -4.046 -12.268  1.00  0.00   O
 ATOM 27  C2  ADMA1B  5.398  -5.107 -11.893  1.00  0.00   C
 ATOM 28  O2  ADMA1B  4.700  -5.870 -10.935  1.00  0.00   O
 ATOM 29  C3  ADMA1B  4.533  -3.881 -12.271  1.00  0.00   C
 ATOM 30  O3  ADMA1B  3.254  -4.305 -12.671  1.00  0.00   O
 ATOM 31  C4  ADMA1B  4.406  -2.866 -11.106  1.00  0.00   C
 ATOM 32  O4  ADMA1B  3.754  -1.706 -11.569  1.00  0.00   O
 ATOM 33  C6  ADMA1B  5.743  -1.655  -9.224  1.00  0.00   C
 ATOM 34  O6  ADMA1B  5.227  -0.368  -9.490  1.00  0.00   O
 ATOM 35  H5  ADMA1B  6.383  -1.951 -11.270  1.00  0.00   H
 ATOM 36  H1  ADMA1B  7.300  -5.545 -10.905  1.00  0.00   H
 ATOM 37  HO1 ADMA1B  7.013  -3.281 -12.602  1.00  0.00   H
 ATOM 38  H2  ADMA1B  5.572  -5.738 -12.788  1.00  0.00   H
 ATOM 39  HO2 ADMA1B  5.261  -6.638 -10.719  1.00  0.00   H
 ATOM 40  H3  ADMA1B  5.014  -3.365 -13.126  1.00  0.00   H
 ATOM 41  HO3 ADMA1B  2.756  -3.507 -12.928  1.00  0.00   H
 ATOM 42  H4  ADMA1B  3.788  -3.323 -10.307  1.00  0.00   H
 ATOM 43  HO4 ADMA1B  3.668  -1.103 -10.809  1.00  0.00   H
 ATOM 44 1H6  ADMA1B  6.749  -1.553  -8.805  1.00  0.00   H
 ATOM 45 2H6  ADMA1B  5.131  -2.153  -8.466  1.00  0.00   H
 TER
 
 
 thanks in advance ..
   parichita...
 
 
   
 
 


Parichita Mazumder 
Junior Research Fellow 
C/O Dr. Chaitali Mukhopadhayay 
Department of Chemistry 
University of Calcutta 
92,A P C Road 
Kolkata-79 
India.


   
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