(3S,5aR,6R,7R,8R,9aS)-3-[N-(tert-butoxycarbonyl)amino]-6,7-bis(acetoxy)-8-[(acetoxy)methyl]octahydropyrano[2,3-b][1,5]oxazepin-4-one

(3S,5aR,6R,7R,8R,9aR)-3-[N-(tert-butoxycarbonyl)amino]-6,7-bis(benzyloxy)-8-[(benzyloxy)methyl]octahydropyrano[2,3-b][1,5]oxazepin-4-one