(installation: Open Babel 2.4.0)

I'm getting a distorted ring (the 5-ring) when using
obminimize with -ff GAFF

454.smi
OC1=CC=C(C=C1)C2=NN=C(O2)SCC#C

obabel -ismi 454.smi -O 454.mol2 --gen3D -h
obminimize -ff GAFF -o mol2 454.mol2 > 454-gaff.mol2

when -ff GAFF is omitted the results look ok.

Is this a bug or an omission in GAFF?
Anyway to detect of avoid these kind of issues with GAFF?


best wishes,

Eiso

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