(1R,4R)-4-[[(1,1-Dimethylethoxy)carbonyl]amino]-2-cyclopentene-1-carboxylic Acid Methyl Ester is an intermediate in synthesizing trans-Abacavir Dihydrochloride (A104995), which is an impurity of Abacavir. Abacavir (A104990) is a carbocyclic 2′-deoxyguanosine nucleoside reverse transcriptase inhibitor and an anti-HIV drug used to treat HIV infection (1). Intracellular enzymes convert Abacavir to its active form, carbovir-triphosphate (CBV-TP), which then selectively inhibits HIV reverse transcriptase […]