C15H12O5
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M  END
> <UNIQUE_SMILES>
OC(C1OC2=CC(=CC=C2C1=O)O)C3=CC=C(O)C=C3

> <USER_SUPPLIED_SMILES>
C1(C=C(O)C=CC=1C(O)C2(OC3(C(C(=O)2)=CC=C(C=3)O)))

$$$$
