Synonyms: (1R,2S)-2-[(Phenylmethoxy)methyl]-3-cyclopenten-1-ol; Entecavir intermediate N1; (1S,2R)-2-((4-methylbenzyloxy)methyl)cyclopent-3-enol; Entecavir intermediate 1; (1S,2R)-2-[(benzyloxy)methyl]cyclopent-3-en-1-ol; 3-Cyclopenten-1-il,2-[(phenylmethoxy)methyl]-,(1R-trans); (1S, 2R)-2-(Benzyloxymethyl)-1-hydroxy-3-cyclopentene; (1S, 2R)-2-(Benzyloxymethyl)-1-hydroxy-3-cyclopentene