3-Benzoyl-1-((4S,5R)-2,2-dimethyl-5-vinyl-[1,3]dioxolan-4-ylmethyl)-1H-pyrimidine-2,4-dione

(S)-2-[((4R,5R)-2,2-Dimethyl-5-(R)-oxiranyl-[1,3]dioxolane-4-carbonyl)-amino]-4-methyl-pentanoic acid tert-butyl ester

(S)-2-((3aR,7R,7aR)-7-Hydroxy-2,2-dimethyl-4-oxo-tetrahydro-[1,3]dioxolo[4,5-c]pyridin-5-yl)-4-methyl-pentanoic acid tert-butyl ester

(S)-2-((3R,4S,5R)-5-Benzyloxy-3,4-dihydroxy-2-oxo-piperidin-1-yl)-4-methyl-pentanoic acid tert-butyl ester