| http://www.w3.org/ns/prov#value | - hiophenyl, 2-chloro-4-methylsulfonylphenyl, 2-chloro-4-methylsulfonylphenyl; for R1 or R2, when one of R1 and R2 is a hydrogen atom or a C1 -C3 alkyl and the other a CO--R8 groups, preferred meanings of CO--R8 are acetyl, formyl, propanoyl, chloroacetyl, bromoacetyl, difluoroacetyl, trifluoroacetyl, dichloroacetyl, trichloroacetyl, hydroxyacetyl, 2,3-dihydroxypropanoyl, dimethylaminoacetyl, acetox
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