The number of tautomers differs significantly , depending on the starting structure and whether it is read from SDF or SMILES.
Tests at https://sourceforge.net/p/ambit/code/4881/tree/trunk/ambit2-all/ambit2-tautomers/src/test/java/ambit2/tautomers/test/TestTautomersFromSDF.java
This is still a valid issue
O=C1OC3=CC=CC=C3(C(O)C1C(C=2C=CC=CC=2)CC(=O)C) 6 tautomers
O=C1OC3=CC=CC=C3(C(O)C1C(C=2C=CC=CC=2)CC(=O)C)
C3=C(C(C1=C(OC2=C(C1=O)C=CC=C2)O)CC(=O)C)C=CC=C3 9 tautomers
C3=C(C(C1=C(OC2=C(C1=O)C=CC=C2)O)CC(=O)C)C=CC=C3
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This is still a valid issue
O=C1OC3=CC=CC=C3(C(O)C1C(C=2C=CC=CC=2)CC(=O)C)
6 tautomers
C3=C(C(C1=C(OC2=C(C1=O)C=CC=C2)O)CC(=O)C)C=CC=C3
9 tautomers