| http://www.w3.org/ns/prov#value | - sting of an acyl group having 2 to 5 carbon atoms, a cyano group, an alkoxycarbonyl group having 2 to 5 carbon atoms, a carbamoyl group and an arylcarbamoyl group; and especially preferably an acetyl group, a cyano group, a methoxycarbonyl group, an ethoxycarbonyl group, a N-phenylcarbamoyl group, or a N-(2-methoxyphenyl)carbamoyl group.In the first embodiment of the present invention, where the c
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