Bugs item #3017553, was opened at 2010-06-17 13:28
Message generated for change (Tracker Item Submitted) made by kosatab
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Category: Library Functions
Group: 2.2.x
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Beda Kosata (kosatab)
Assigned to: Nobody/Anonymous (nobody)
Summary: SSSR reports a wrong number of rings in some cases

Initial Comment:
The following two molecules are an example of problems that the SSSR algorithm 
has:
http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=141105
http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=165896

In the first case only 4 of the 5 rings are reported - the inner 4 membered 
ring is not, probably due to false detection of its independence of the other 4.
In the second case, one of the rings has 48 atoms which seems to be above some 
internal limit of the SSSR algorithm.
In both cases the results from openbabel do not correspond to the rule of 
dependence between the number of components of a graph, vertices, edges and 
rings.
I would be glad to provide more info if needed.
Beda


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