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Entecavir impurity C Entecavir Impurity G Entecavir EP Impurity B Entecavir USP Impurity C Entecavir (1S,3S,4S) Diastereomer Entecavir EP Impurity B（USP Impurity C） Entecavir Impurity 7(Entecavir EP Impurity B) 2-amino-9-[(1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylidenecyclopentyl]-1~{H}-purin-6-one 2-amino-9-((1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1,9-dihydro-6H-purin-6-one 6H-Purin-6-one, 2-amino-1,9-dihydro-9-[(1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]- 2-Amino-9-[(1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylidenecyclopentyl]-1,9-dihydro-6H-purin-6-one 2-amino-9-((1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1H-purin-6(9H)-one hydrochloride? (Entecavir Impurity） Entecavir impurity 5/(1S,3S,4S)-Entecavir/2-Amino-1,9-dihydro-9-[(1S,3S,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]-6H-purin-6-one