| http://www.w3.org/ns/prov#value | - I) or (II) ##STR4## wherein Y is a hydrogen atom, an alkyl group, an aryl group, a halogen atom or an electron attracting group, Ar is a phenyl or naphthyl group which can be substituted, R is an alkyl or aralkyl group which can be substituted, and the aromatic ring substituted with a hydroxyl group can be a benzene ring or a naphthalene ring. 2.
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