3-Hydr-oxy-1,2,3,9-tetra-hydro-pyrrolo[2,1-b]quinazolin-4-ium chloride dihydrate: (+)-vasicinol hydro-chloride dihydrate from Peganum harmala L.

The title compound, C11H13N2O+·Cl−·2H2O, the dihydrate of (+)-vasicinol hydro­chloride, is a pyrrolidinoquinazoline alkaloid. It was isolated from the ethyl acetate fraction of the leaves of Peganum harmala L. The pyrrolidine ring has an envelope conformation with the C atom at position 2 acting as the flap and the C atom at position 3, carrying the hydroxyl substituent, has an S configuration. The absolute configuration was determined as a result of the anomalous scattering of the Cl atom. In the crystal structure, mol­ecules stack along the a axis, connected to one another via inter­molecular O—H⋯Cl and N—H⋯Cl hydrogen bonds, forming approximately triangular-shaped R21(7) rings, and O—H⋯Cl and O—H⋯O hydrogen bonds, forming penta­gonal-shaped R54(10) rings. The overall effect is a ribbon-like arrangement running parallel to the a axis.