| http://www.w3.org/ns/prov#value | - oup, an acid halide group, an activated ester, a mixed anhydride, an acyl imidazole, an N-(carbonyloxy)imide group, an iminoester, a primary amine, an aldehyde group, an alphahalomethylcarbonyl group, a hydrazine group, an acylhydrazide group, an azide group and an N-maleimide group; at least two of A, B and E are other than hydrogen; and R1 is an aliphatic group of at least two carbons or an arom
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