prov:value
| - In the case where two or more of the groups R1 to R5, two or more of the groups R6 to R10, or two or more of the groups R11 to R15 are a group other than the hydrogen atom, such a group other than the hydrogen atom is preferably a hydroxyl group, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, methoxy group, t-butoxy group, o
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