prov:value
| - or unsaturated, straight or branched;A is a chromophoric aromatic or heteroaromatic ring or ring system, and A carries 1 to 8 substituents selected from the group consisting of hydrogen, hydroxy, mercapto, amino, acyl, ester, esterified hydroxy group, cyano, nitro; substituted,saturated or unsaturated, straight or branched alkyl, alkoxy, alkylthio and arylalkoxy groups; substituted or unsubstitut
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