A new compound with molecular formula as C(10)H(9)N(3)O(2)S, was derived from 2-(methylthio)-4-(pyridin-3-yl)pyrimidine. The crystal is monoclinic, space group C2/c with unit cell parameters: a = 5.4625 (8) angstrom, b = 10.8235 (16) angstrom, c = 17.520 (3) angstrom, alpha = 90 degrees, beta= 97.460 (3)degrees, gamma = 90 degrees, V = 1027.1 (3) angstrom(3), Z = 4, Mr = 235.00, Dc = 1.521 g/cm(3), mu = 0.300 mm(-1). F(000) = 488. R =0.0443, wR = 0.1061 for 2413 reflections with 1> 2 sigma(1).