非那西丁0脱乙基得扑热息痛 NHCOCH3 NHCOCH NHCOCH3 LOI OCH CH3 O-CHCH3 OH OH Phenacetin more active than phenacetin P海医药工业研究院 SFPHGRMACEUTCAL NDUSTRY非那西丁O-脱乙基得扑热息痛 NHCOCH3 OCH2CH3 NHCOCH3 O CHCH3 OH [O] NHCOCH3 OH Phenacetin more active than phenacetin