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          English name: Entecavir
          Chemical name: 2-Amino-1,9-dihydro-9-[(1S,3R,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]-6H-purin-6-one monohydrate
          Category involved: bulk pharmaceutical chemicals
          Structural type:
          CAS#: 209216-23-9
          Molecular formula: C12H15N5O3.H2O
          Molecular weight: 295.30
          Quality standard: Comply with the standards of Merck
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