英文别名Doxycycline Impurity 3; Doxycycline EP Impurity C; 4-epi-Doxycycline; (4R,4aR,5S,5aR,6R,12aS)-4-(Dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacenecarboxamide; Doxycycline Impurity 7; Doxycycline hyclate EP Impurity C 
