Abacavir sulfate sulfate, a cyclically substituted base analog, presents a unique structural profile. Its empirical formula is C14H18N6O4·H2SO4, resulting in a molecular weight of 393.41 g/mol. The compound exists as a white to off-white substance and is practically AMPHOTERICIN B 1397-89-3 insoluble in ethanol, slightly soluble in water, and free