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In the title compound, C9H18NO+·NO3-, the piperidinium ring adopts a slightly deformed chair conformation and the nitrate anion is disordered. The ions are arranged in hydrogen-bonded chains parallel to [001], in which the cations alternate with the anions. The intra­chain hydrogen bonds are bifurcated and link the O atoms of the anions to the N atoms of the cations.

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The title compound, C21H28O4, has a 4-acet­oxy substituent positioned on the steroid [alpha] face. The six-membered ring A assumes a conformation inter­mediate between 1[alpha],2[beta]-half chair and 1[alpha]-sofa. A long Csp3-Csp3 bond is observed in ring B and reproduced in quantum-mechanical ab initio calculations of the isolated mol­ecule using a mol­ecular-orbital Hartree-Fock method. Cohesion of the crystal can be attributed to van der Waals inter­actions and weak C-H...O hydrogen bonds.
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