(2R,4S)-2-tert-Butoxycarbonylamino-4-((3aR,6R,7R,7aS)-7-hydroxy-2,2-dimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-6-ylmethyl)-pentanedioic acid dimethyl ester

(2R,4S)-2-tert-Butoxycarbonylamino-4-((3aR,6R,7S,7aS)-7-hydroxy-2,2-dimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-6-ylmethyl)-pentanedioic acid dimethyl ester