英文别名Entecavir (1S,3S,4S) Diastereomer; Entecavir impurity C; Entecavir Impurity G; Entecavir Impurity 7; Entecavir EP Impurity B; Entecavir impurity 5; 6H-Purin-6-one, 2-amino-1,9-dihydro-9-[(1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]- 
