Gemcitabine HCl is a nucleoside analogue that exhibits antitumor activity. Gemcitabine HCl is 2'-deoxy-2',2'-difluorocytidine monohydrochloride (b-isomer). The empirical formula is C9H11F2N3O4·HCl. It has a molecular weight of 299.66. Gemcitabine HCl is a white to off-white solid. It is soluble in water, slightly soluble in methanol and practically insoluble in ethanol and polar organic solvents.