Hi Yankang Jing,

From  my chemical background I would recommend to not turn off the 
aromatization cause tautomers are formed thanks to this equilibrium in such 
system of multiple rings.

BR

guillaume


De : Yankang Jing <yj...@reactivebio.com>
Date : mercredi, 15 juin 2022 à 01:05
À : rdkit-discuss@lists.sourceforge.net <rdkit-discuss@lists.sourceforge.net>
Objet : [*External*] [Rdkit-discuss] Question on tautomer standardization on 
RDKit
Dear all,

I have a question on tautomer standardization using RDKit.

Is that a way to turn off the aromatization of ring system when generating the 
tautomer enumerator?
For example,


[cid:image001.png@01D88085.F13F1AC0]


•
[cid:image002.png@01D88085.F13F1AC0]
[cid:image004.png@01D87FEA.1E10EC50]


•
[cid:image005.png@01D87FEA.3925E810]


Here is the code I used.
def TautomerStandardization (mol):
    _params = rdMolStandardize.CleanupParameters()
    _params.tautomerRemoveSp3Stereo = False
    _params.tautomerRemoveBondStereo = False
    _params.tautomerRemoveIsotopicHs = False
    _params.maxTautomers = 1000
    _params.maxTransforms = 1000
    enumerator = rdMolStandardize.TautomerEnumerator(_params)
    mol = enumerator.Canonicalize(mol)
    return mol



Yankang

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