title: 3Beta-(1-allyl-1-pyrrolidinio)-16-(2-pyridylmethylene)androst-5-en-17beta-ol bromide hemihydrate.
abstract: The title compound, C(32)H(45)N(2)O(+).Br(-).0.5H(2)O, has the outer two six-membered rings in chair conformations, while the central ring is in an 8beta,9alpha-half-chair conformation. The five-membered ring of the steroid nucleus adopts a slightly deformed 14alpha-envelope conformation. The pyridylmethylene moiety has an E configuration with respect to the hydroxyl group at position 17. The structure is stabilized by a network of O-H...Br-type intermolecular hydrogen bonds.