OH HO OH HoSO 4 酚酞 O HO O O OH ①D HSO. CO,H ⑨D OH O 荧光黄Organic Chemistry Organic Chemistry Xiamen Xiamen University University OH O O O + H 2SO 4 酚酞 O C O OH HO OH O O O + H 2SO 4 OH HO O O CO 2 H 荧光黄