prov:value
| - wherein, R14 and R15 are the same or different, and an alkyl group, an alkoxy group, a halogen atom, a nitro group or a hydroxyl group, and when the methylene groups on the benzene ring which phosphorous atoms are bound to are mutually at o-position, r is an integer of 1 to 4, and when said methylene groups are mutually at m position or p position, r represents an integer of 4 to 8, and X is as de
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