prov:value
| - R3, R4 and R5, independently of one another, are hydrogen or C1 -C4 alkyl, which can be substituted by halogen, hydroxyl, cyano, C1 -C4 alkoxy, C1 -C4 alkoxycarbonyl, carboxyl, sulfamoyl, sulfo or sulfato, B is an aliphatic or aromatic bridging member, and Z1 and Z2 are hydrogen or an aliphatic, aromatic or heterocyclic radical, or Z1 and Z2, together with the nitrogen atom linking them, form a f
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