(3R,3aS,4S,6aS)-4-[(2R,3R)-4-(benzyloxy)-3-hydroxy-2-methylbutyl]-3a-hydroxy-6a-(hydroxymethyl)-3-methyldihydro-1H-furo[3,4-b]pyrrole-2,6(3H,4H)-dione

(3S,7aS)-methyl 3-tert-butyl-6-methyl-5-oxo-7-(trifluoromethylsulfonyloxy)-1,3,5,7a-tetrahydropyrrolo[1,2-c]oxazole-7a-carboxylate