| http://www.w3.org/ns/prov#value | - up, a hydroxy group, an alkoxy group, an alkoxymethyl group, an acyl group or an alkoxycarbonyl group, R is a hydrogen atom, an alkyl group which may be substituted with halogen, with alkoxy, with alkylthio or with cyano, a 1-cycloalkenyl group, a benzyl group which may be substituted with halogen, a hydroxy group, an alkoxy group, an acyl group, an alkoxycarbonyl group, an alkoxythiocarbonyl grou
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