prov:value
| - roup; Z is a nucleophilic group, and it is able to attack the X, when the above-said compound is oxidized; n is 1 or 2, when X is --PO<, or n is 1, when X is another group; R1 and R2, or R3 and R4, or at least two kinds of atoms or substituents arbitrarily selected from Y1k, Z1k, and P may be independently linked each other to form a ring, respectively.
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