| http://www.w3.org/ns/prov#value | - d or unsubstituted C1-3 alkyl, substituted or unsubstituted C6-12 arylC1-3 alkyl or substituted or unsubstituted C6-12 aryl, said R7, R8 and R9 substituents being independently R10 ; R10 is R11 or --Alk1 (R11)m, wherein m is an integer of 0 to 3 and Alk1 is straight or branched C1-6 alkylene, C2-6 alkenylene or C2-6 alkynylene, said Alk1 group containing from zero to three --O--, --S--, --N(R6)--
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