methyl 2-pyridazin-1-ium-1-ylacetate,bromide

2-溴戊二酸二甲酯

5,5-二苯基四氢呋喃-2-酮

methyl 2-(2-methyl-3-oxo-1H-inden-2-yl)acetate

methyl 3-[(2-methoxy-2-oxoethyl)amino]benzoate