| http://www.w3.org/ns/prov#value | - amino, and R2, R3 and R4 are all H and wherein R1 is amino and each of R2, R3 and R4 is unsubstituted C1 -C6 -alkyl or alkenyl or C1 C6 -alkyl or alkenyl substituted by a substituent selected from the group consisting of chlorine, fluorine, bromine, iodine, hydroxy, carboxy, nitro, cyano and thiol; hydroxyl; C1 -C6 -alkoxy; carboxyl or amino or R2 is an amino or substituted amino and each of R1,
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