prov:value
| - When the monovalent substituent represented by Rb, R11, R12, R13, R14, R15, R16, R17, or R18 is alkyl in Formula (II), the alkyl is preferably alkyl having 1 to 4 carbon atoms, such as methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, or tert-butyl, more preferably methyl, ethyl, propyl, or isopropyl, and particularly preferably methyl or ethyl.
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