n-Butyl 2-(3-chloro-1,2-dihydro­pyrazin-2-yl­idene)-2-cyano­acetate


The title compound, C(11)H(12)ClN(3)O(2), is essentially planar except for the n-but-oxy group [r.m.s. deviation from the least-squares plane = 0.0131 (1) Å for 11 non-H atoms]. An intra-molecular N-H⋯O inter-action results in the formation of an S(6) ring. The n-butoxy chain in the molecule is disordered over two sets of sites of equal occupancy. 
DOI: 10.1107/S1600536809031870

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