methyl 6-ethoxy-2-oxo-1,3-benzothiazole-3-carboxylate

2,3-二氢-1-吲哚羧酸甲酯

methyl N-(2-methylbut-3-yn-2-yl)carbamate

1-Carbomethoxy-5-aminoimidazole-4-carbonitrile

methyl 4-amino-5-cyanoimidazole-1-carboxylate