| http://www.w3.org/ns/prov#value | - ???NR14COCOR15 in which R14 is a hydrogen or a (C1-C7)alkyl, preferably a hydrogen, and R15 is a (C1-C4)alkoxy, preferably an ethoxy; and in which R25 is a hydrogen or a (C1-C7)alkyl, preferably a hydrogen, and R26 and R27 are each independently a hydrogen or a (C1-C7)alkyl; R27 can also be a formyl or a (C1-C7)alkylcarbonyl; R26 and R27 are preferably a hydrogen; and and their salts, especially p
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