N-(甲氧羰基)-L-丝氨酸甲酯

4,5-dihydro-oxazole-4-carboxylic acid methyl ester

tert-butyl 1-({[(1S)-1-(hydroxymethyl)-2-methoxy-2-oxoethyl]amino}carbonyl)-(1S,4R)-7-azabicyclo[2.2.1]hept-2-ene-7-carboxylic acid

tert-butyl 1-({[(1S)-1-(hydroxymethyl)-2-methoxy-2-oxoethyl]amino}carbonyl)-(1R,4S)-7-azabicyclo[2.2.1]hept-2-ene-7-carboxylic acid