英文别名2-Amino-9-((1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1H-purin-6(9H)-one; 2-Amino-9-[(1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]-1,9-dihydro-6H-purin-6-one; 2-amino-9-((1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-3,9-dihydro-6H-purin-6-one; Entecavir Impurity 1; 2-Amino-9-[(1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylidenecyclopentyl]-1H-purin-6-one; Entecavir Impurity 112; 2-amino-9-[(1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylidenecyclopentyl]-6,9-dihydro-1H-purin-6-one; 2-amino-9-((1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1,9-dihydro-6H-purin-6-one; Entecavir (1R, 3R, 4R) Diastereomer; Entecavir (R,R,R)-Isomer; 1,4-Epi Entecavir; Entecavir Impurity ETY-2 
