| http://www.w3.org/ns/prov#value | - wherein each of ring A, R(4), R(5), R(6), R???(4), R???(5), R???(6), X, and M has the same meaning as described above; R(7) represents a hydrogen atom or a lower alkyl group such as a methyl group or ethyl group; and R(8) represents a lower alkyl group such as a methyl group or ethyl group.
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