| http://www.w3.org/ns/prov#value | - Each of R1, R3 and R5 is a hydrogen atom or methyl group, R7 is selected from the group consisting of tert-butyl, methoxymethyl, tetrahydropyranyl, and trialkylsilyl groups, and R8 is a lower alkoxy group such as a methoxy and ethoxy group or a hydrogen atom.
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