| http://www.w3.org/ns/prov#value | - More preferably, Y1 is a hydrogen atom and Y2 is an acyl group, an aliphatic oxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a sulfamoylcarbamoyl group, an aliphatic sulfonyl group, an arylsulfonyl group, a sulfamoyl group, a phosphoryl group or a phophonyl group, and still more preferably Y1 is a hydrogen atom and Y2 is an acyl group, an aliphatic oxycarbonyl group, a carbamoyl gr
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