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

(2S,3R,4S)-3,4-bis(benzyloxy)-2-(benzyloxymethyl)-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