prov:value
| - logen, methyl, or hydroxy; R31 is hydrogen, halogen, methyl or hydroxy, or R31 together with R25, designates methylene or oxo; and A is a carbon atom or a nitrogen atom; and when A is a carbon atom, R7 is hydrogen, hydroxy or halogen; and R8 is hydrogen, halogen, hydroxy, C1-C4 alkyl, methylene or oxo, or R7 designates, together with R8, an additional bond between the carbon atoms at which R7 and
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