4-Amino-1-((2R,3R,4R,5R)-3-(((2S,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)oxy)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1,3,5-triazin-2(1H)-one is an impurity of 5-Azacytidine (A796000), a potent growth inhibitor and cytotoxic agent. 5-Azacytidine also act as a demethylating agent by inhibiting DNA methyltransferase.