2-Deoxycytidine hydrochloride is an orally effective nucleic acid biosynthesis enzyme inhibitor. 2-Deoxycytidine hydrochloride competes with nucleic acid biosynthesis enzymes and nucleoside transporters, thereby reducing the toxicity of cytarabine. 2-Deoxycytidine (hydrochloride) can be used in the research of L1210 lymphoblastic leukemia[1].