| http://www.w3.org/ns/prov#value | - uted aralkyl group or --CO--R8, wherein R8 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted aralkyl group; provided that at least one of R2, R3 and R4 represents a group other than the group consisting of a hydrogen atom, a methyl group or --OR5.
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