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- [21] Crystal structure of 9-benzoyl-5-methoxy-7-phenyl-7-phthalimido-2,2,3,3-tetramethyl-1,4,6-trioxa-5-phospha(V)spiro[4,4]non-8-en, C62H60N2O14P2 and of dimethyl 3-(4,4,4′,4′,5,5,5′,5′-octamethyl-1,1′,3,3′-tetraoxa-2-phospha(V)-spiro[4,4]nonanyl)-2(N,N-dimethyl)succinate), C20H38NO8P, two tetraoxaspiro-phosphorane(V) intermediates [J]. ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES, 2000, 215 (04): : 539 - 543