(4-甲基-2-氧代-2H-1-苯并吡喃-7-基)氨基甲酸乙酯

methyl 7-ethoxycarbonylaminocoumarin-4-acetate

ethyl 7-N-(carbethoxy)aminocoumarin-4-acetate

(4-ethoxycarbonylamino-2-hydroxy-phenyl)-arsonic acid

(4-amino-2-hydroxyphenyl)arsonic acid