Structure of ethyl 2-(3-methyl-1,2,4-oxadiazol-5-yl)-2-phenylhydrazonoethanoate

C 13 H 14 N 4 O 3 , M r =274.3, orthorhombic, Pna2 1 , a=19.048 (6), b=10.507 (4), c=6.691 (4) A, V=1339. 1 A 3 , Z=4, D m =1.36 (flotation), D x =1.360 Mg m -3 , λ(Mo Kα)=0.7107 A, μ=0.933 cm -1 , F(000)=576, T=298 K, R=0.0839, wR=0.0643 for 773 observed reflections. The whole molecule is approximately planar, which can be seen from the values of the torsion angles about the non-rigid bonds; the molecular dimensions are in agreement with those found in analogous compounds