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organic compounds
The structure of the title compound C31H39NO7Si was determined and found to be a fused tricyclic nitroso acetal. Remarkable features include a twist boat conformation of the tetrahydro-1,2-oxazine ring and a highly pyramidalized N atom [(angles) = 310.6(6°]. Three of the contiguous stereocenters in the nitroso acetal are of the same correct relative and absolute configuration as found in (+)-crotanecine.