142166-00-5
3-氧代-3,4-二氢-2H-苯并[b][1,4]噁嗪-7-羧酸甲酯
→
~75%
201294-27-1
methyl 4-methyl-3-oxo-1,4-benzoxazine-7-carboxylate
63435-16-5
4-氨基-3-羟基苯甲酸甲酯