| http://www.w3.org/ns/prov#value | - When the monovalent substituent represented by Ra, R1, R2, R3, R4, R5, R6, R7, R8, R9, or R10 is alkyl in Formula (I), 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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