prov:value
| - ydrogen or halogen atom or a group selected from alkyl, ???OR8, where R8 is a hydrogen atom or an optionally substituted alkyl group, ???SR8, ???NR8R9, where R9 is as just defined for R8 and may be the same or different, ???NO2, ???CN, ???CO2R8, ???SO3H, ???SOR8, ???SO2R8, ???OCO2R8, ???CONR8R9, ???OCONR8R9, ???CSNR8R9, ???COR8, ???OCOR8, ???N(R8)COR9, ???N(R8)CSR9, ???SO2N(R8)(R9), ???N(R8)SO2R9,
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