(1S-cis)-4-(2-Amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-methanol Monohydrochloride; ((1S,4R)-4-(2-amino-6-chloro-9H-purin-9-yl)cyclopent-2-en-1-yl)methanol Hydrochloride; Abacavir Related Compound C; Abacavir Impurity 8; (1S,4R)-4-(2-Amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-methanol Hydrochloride ; [(1S,4R)-4-(2-Amino-6-chloro-9H-purin-9-yl)cyclopent-2-enyl]methanol hydrochloride ; Abacavir 6- Chloro Analog ; (1S-cis)-4-(2-Amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-methanol Monohydrochloride ; Abacavir USP Related Compound C