(2S,4aR,6aS,9aR,9bR)-9-methyl-2-phenylhexahydro-[1,3]dioxino[4',5':5,6]pyrano[4,3-d]oxazol-8(4H)-one

(2S,5S)-5-[N-(9-fluorenylmethoxycarbonyl)amino]tetrahydropyran-2-carboxylic acid

(3aS,6R,7R,7aS)-6-(((tert-butyldimethylsilyl)oxy)methyl)-7-hydroxyhexahydro-2H-pyrano[4,3-d]oxazol-2-one

(2S,5S)-5-[(tert-butoxycarbonyl)amino]-2-[(tert-butyldimethylsilanyloxy)methyl]-2,5-dihydro-6H-pyran