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Today's Topics:
1. How to get MCS to respect rings? (A. Heifets)
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Message: 1
Date: Sat, 20 Aug 2011 17:47:38 -0400
From: "A. Heifets" <abe...@cs.toronto.edu>
Subject: [Cdk-user] How to get MCS to respect rings?
To: cdk-user@lists.sourceforge.net
Message-ID:
<CAHVeH83_Fd5UHt3t9WLTwCTyBD3o=9FNjXSBzdtktGuuWrn=x...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hello CDK experts,
When I take the maximum common substructure of
c1(ccc2c(c1)c(c([nH]2)C(=O)N)S(=O)(=O)N1CCOC(C1)C(=O)N1CCc2c(C1)cccc2)Br
and
c1(ccc2c(c1)c(c([nH]2)C(=O)N)S(=O)(=O)N1CCOC(C1)C(=O)NCCOc1ccccc1)Br
I get a surprising result where some of the atoms in a ring are
considered matched to some atoms not in a ring (atoms 25, 26, and 27
in my executions, although I don't know if the numbers will always be
consistent). I'd like the maximum common substructure to consider two
atoms equivalent only if both (or neither) are in a ring.
I'm using the SMSD but it seems (in this case) just to call CDKMCS. I
tried specifying different chemical filters but (1) it doesn't solve
the problem and (2) this shouldn't be a post facto ordering on matches
but rather part of the atom correspondence in the MCS computation.
Can anyone point me to a switch I can throw to get MCS to respect ring
membership? If that doesn't exist, I'd be willing to write some code
(if someone could suggest a better plan than modifying every
matches(IAtom atom) method for every class implementing IQueryAtom).
Thank you!
Cheers,
Abe
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