(2S,3R)-2-amino-3-hydroxy-3-(4-nitro-phenyl)-propionic acid methyl ester

(1S,2R,5S,8R,1'R)-5-(1'-hydroxy-p-nitrobenzyl)-8,11,11-trimethyl-3-oxa-6-azatricyclo[6.2.1.02,7]undec-6-en-4-one

(2RS,3SR)-2-amino-3-hydroxy-3-(4-nitro-phenyl)-propionic acid

(1RS,2RS)-1,3-diacetoxy-2-acetylamino-1-phenyl-propane

(1R,2R)-1,3-diacetoxy-2-acetylamino-1-(4-nitro-phenyl)-propane