(3AR,5S,5aR,8aS,8bR)-methyl 2,2,7,7-tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4',5'-d]pyran-5-carboxylate 1g

(3AR,5S,5aR,8aS,8bR)-methyl 2,2,7,7-tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4',5'-d]pyran-5-carboxylate 1g