prov:value
| - , NO2, OH, NH2, NHArg, NHRj, NRkR1, SO3H, SO2NH2, SO2NHArh, SO2NHRm, SO2Ari, SO2Rn, CF3, CN, COOH, COORP, CONH2, CONHArj, CONHRq, ORv, COArk or CORr; Rjr, R are each independently Cl 5 alkyl groups; Argk are each independently aryl groups; and with the proviso that at least one of the substituents R5, R6, R7, R8 and R9 is other than H ; R, R, R and R13 are each independently H, C15 alkyl, haloge
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