| http://www.w3.org/ns/prov#value | - an alkyl group having 1 to 6 carbon atom(s) unsubstituted or substituted with one ???phenyl group substituted with an amino group unsubstituted or substituted with 1 or 2 alkyl group(s) having 1 to 6 carbon atom(s)??? with the proviso that when R3 is a methyl group, both R1 and R2 do not represent methyl groups, or
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