Synthesis of 22,23‐methano‐24‐nor‐cholest‐5‐en‐3β‐ol and comparison with cystosterol 22,23‐Methano‐24‐nor‐cholest‐5‐en‐3β‐ol, a novel cyclopropane‐containing sterol was synthesized from stigmasterol and found to be different from the isomeric, naturally occurring marine sterol cystosterol. Copyright © 1979 Verlag GmbH & Co. KGaA, Weinheim