(1R,6S,7S,7aS)-6,7-bis(benzyloxy)-1-((E)-prop-1-en-1-yl)-tetrahydro-1H-pyrrolizin-3(2H)-one

(3S,4S)-3,4-bis(benzyloxy)-6-[(3aS,4S,6R,6aS)-tetrahydro-4-methoxy-2,2-dimethylfuro[3,4-d][1,3]dioxol-6-yl]-1-azabicyclo-[3.2.0]heptan-7-one

(3S,4S)-3,4-bis(benzyloxy)-6-[(3aR,6R,6aS)-tetrahydro-2,2-dimethylfuro[3,4-d][1,3]dioxol-6-yl]-1-azabicyclo[3.2.0]heptan-7-one

(3S,4S)-3,4-bis(benzyloxy)-6-[(3aR,5R,5aS,8aS,8bR)-tetrahydro-2,2,7,7-tetramethyl-3aH-bis[1,3]dioxolo[4,5-b:4',5'-d]pyran-5-yl]-1-azabicyclo[3.2.0]heptan-7-one

1,4-bis[(3aR,5R,5aS,8aS,8bR)-tetrahydro-2,2,7,7-tetramethyl-3aH-bis[1,3]dioxolo[4,5-b:4',5'-d]pyran-5-yl]buta-1,3-diyne