organic compounds
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The title compound, C31H48N2O3, is a Beckmann rearrangement product. The isopropenyl and methoxycarbonyl groups have β-orientations, whereas the 2-cyanoethyl group has an α-orientation. In the triterpenoid skeleton, the seven-membered lactam ring, as well as the three six-membered carbocyclic rings, have chair conformations. In the crystal, molecules are linked via nonclassical C—HO hydrogen bonds into layers parallel to the ab plane.