Abacavir

Abacavir is a synthetic analogue of guanine, a naturally occurring purine nucleoside. It differs structurally from other reverse transcriptase inhibitors (didanosine, lamivudine, stavudine, zalcitabine, and zidovudine) in that it is a carbocyclic nucleoside analogue rather than a dideoxynucleoside analogue. [#]
Source: Aids Info Drugs - Category: Drugs & Pharmacology Source Type: research