N-acetyl-D-alanine 4-nitrophenyl ester

D-丙氨酸

p-nitrophenyl 6-O-β-D-glucopyranosyl-β-D-glucopyranoside

(S)-2-Methoxy-propionic acid 4-nitro-phenyl ester

4-nitrophenyl (4-t-butylphenoxy)acetate