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The title compound, C 18 H 14 N 4 O 2 , was found as a by-product in the nitro­aldol reaction between 2-(nitro­meth­yl)pyridine and  N -(pyridin-2-ylmethyl­idene)methane­amine. Its two stereogenic centers give rise to four stereoisomers of which only the  anti  isomers are found in this crystal structure.

1-Nitro-2,3-di-2-pyridyl-2,3-dihydroindolizine