Abstract: The crystal of the title compound belongs to monoclinic system.Space group P2₁/n, with dimensions.α = 15.795(4), b = 8.367(3), c = 10.720(4) Å,β = 104.98(3)o, V= 1368.6ų,Z= 4, D_c = 1,409gcm^-3, μ(MoK_α) = 1.067cm^-1, λ(MoK_α) = 0.71069 Å.The final R/R_w = 0.045/0.039 for 235 parameters and 1898 observed refledions were Treasured with an FNRAF-NONIUS CAD-4 diff-ractometer using MoK_α radiation at 293K.The molecule consists of fluorouracil moiety and o-toluyl group which are virtually perpendicular to each other.The present paper deals with brief discussion of the structural features which may be responsible for its special antitumor activity for the title compound.