6H-Furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-6-one, 2-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-2,3,3a,9a-tetrahydro-7-methyl-3-(phenylmethoxy)-2-[(phenylmethoxy)methyl]-, (2S,3S,3aS,9aR)-
6H-Furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-6-one, 2-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-2,3,3a,9a-tetrahydro-7-methyl-3-(phenylmethoxy)-2-[(phenylmethoxy)methyl]-, (2S,3S,3aS,9aR)-