| http://www.w3.org/ns/prov#value | - oup, a C1 -C4 alkylsulfonyl group, a phenylsulfonyl group, a substituted phenylsulfonyl group, an acetylamino group or an anilino group, or R4 and R5 may together form a ring which may contain an oxygen atom),each of R1 and R2 which may be the same or different, is a hydrogen atom (provided that a case where R1 and R2 are both hydrogen is excluded), a halogen atom, a C1 -C6 alkyl group, a C1 -C6 h
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