C27H41NO3, Mr = 427.63, orthorhombic, P212121, a = 14.978(3), b = 21.486(5), c = 7.478(1) Å, V = 2406.6(6) Å3, Z = 4, dc = 1.180 Mg m-3, λ(Cu Kα) = 1.54178 Å, μ = 0.505 mm-1. Full-matrix least-squares refinement (nonhydrogen atoms anisotropic, H atoms isotropic) based on 1988 reflexions led to a final R of 0.064. The steroidal alkaloid exists in a fully extended conformation with all ring junctures trans-fused. The C(17) β-side chain contains a 4-methyl-1-pyrroline moiety rather than the six-membered heterocyclic ketone proposed originally.