In the title compound, a P ...delta(+)-C-atom distance is observed in
the solid state which falls within the range of literature values for
the span of delta(-)...delta(-) charges in the active site of insect a
cetylcholinesterase (AChE), but is outside the range for mammalian ACh
E. The structure of azinphos ethyl is comparable to that of the methyl
analog.