5-ethyl-5-[[(5-ethyl-2-methyl-2-oxo-1,3-dioxa-2$l^{5}-phosphacyclohex- 5-yl)methoxy-methyl-phosphoryl]oxymethyl]-2-methyl-1,3-dioxa-2$l^{5}-p hosphacyclohexane 2-oxide
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