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In the title compound, C17H19NO3, which was obtained by oxidation of the corresponding pyridine derivative, the dihedral angle between the benzene and the pyridine rings is 68.2 (1)°. In the crystal, C—H...O hydrogen bonds to carboxyl and N-oxide O-atom acceptors gives a cyclic dimer substructure with an R22(18) motif which is extended into a undulating sheet structure lying parallel to (100) through weak C—H...Ooxide hydrogen bonds. Also present are π–π ring interactions [ring centroid separation = 3.561 (2) Å]

tert-Butyl 3-(3-methyl-1-oxidopyridin-1-ium-2-yl)benzoate