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In the title compound, C 12 H 17 NO 3 , which was synthesized by Wagner–Meerwein rearrangement of the  N -nitro­imine, the ring-junction C—C bond length is comparatively long [1.573 (2) Å] due to a steric repulsion between the methyl groups at these atoms, which also leads to an increase in the C—C—C angles along this C 4  chain [118.10 (13) and 115.04 (15) °, respectively]. In the crystal, N—H⋯O—C and N—H⋯O=C hydrogen bonds are formed between the amide group and the two O-atom acceptors of the lactone group, forming a chain along [001].

2,6-Dimethyl-4-oxo-3-oxatricyclo[5.2.1.02,6]decane-1-carboxamide

2,6-Dimethyl-4-oxo-3-oxatricyclo[5.2.1.0^2,6]decane-1-carboxamide