(3R,4S,6R)-6-(4-Amino-2-oxo-1,3,5-triazin-1(2H)-yl)tetrahydro-2H-pyran-3,4-diyl Bis(4-methylbenzoate) is an intermediate in the synthesis of 2-Deoxy-D-α-ribopyranosyl-5-azacytosine which is an isomer of 2-Deoxy-D-β-ribopyranosyl-5-azacytosine (D253525), an impurity of Decitabine and potentially carcinogenic.