Hi,

> MASTER        0    0    0    0    0    0    0    0   16    0   16    0
> END
> ENDMDL
> MODEL        3
> COMPND    UNNAMED
> AUTHOR    GENERATED BY OPEN BABEL 2.3.0

I don't know if it will help, but the tag "END" should be the very
last line of the PDB file. There is only one occurence of "END" per
pdb file.
http://www.wwpdb.org/documentation/format23/sect11.html

And ENDMDL is at the end of each model.
http://www.wwpdb.org/documentation/format23/sect9.html

And I think that the COMPND and AUTHOR records are not allowed within
the MODEL record - but won't matter that much, I think :)

Normally, it's the same molecule / same author for each model, only
the coordinates are modified.

But could have e.g. (see http://www.wwpdb.org/documentation/format23/sect2.html)
COMPND    MOL_ID: 1;
COMPND   2 HEMOGLOBIN;
COMPND    MOL_ID: 2;
COMPND   2 BENZENE
like in many PDB complex.

Btw, compound name is lost when converting, with babel 2.2.3, .pdb to
.smi or .sdf.

But I never use pdb format as multi-mol file, and I always convert my
protein-ligand pdb complex in mol2... :)
Never used obminimize too.

Regards,
Pascal

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