(1,4-dibenzyl-5-methoxy-3,6-dioxopiperazin-2-yl) acetate

2-甲基-5-苯并噁唑羧酸

N-methyl-N-(2-nitrophenyl)sulfonylacetamide

2-acetyloxy-2-methylbutanoic acid

2-acetamido-3-nitrobenzoic acid