Red; R23, R24, R41, R52, R135, R149, R169 Yellow: Y14, Y16, Y33, Y93, Y98, Y114 Orange: O60, O63, O107, Violet: V11, V13, [ Descriptors Computed from Structure] IUPAC Name: 3',6'-dihydroxy-4',5'-dinitrospiro[2-benzofuran-3,9'-xanthene]-1-oneCanonical SMILES: C1=CC=C2C(=C1)C(=O)OC23C4=C(C(=C(C=C4)O)[N+](=O)[O-])OC5=C3C=CC(=C5[N+](=O)[O-])OInChI: InChI=1/C20H10N2O9/c23-13-7-5-11-17(15(13)21(26)27) ...
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