In the title mol-ecular salt [systematic name: (5α,6α)-7,8-didehydro-4,5-ep-oxy-17-methyl-morphinan-3,6-diol hydro-chloride], C17H20NO3(+)·Cl(-), the conformation of the morphinium ion is in agreement with the characteristics of the previously reported morphine forms [for example, Gylbert (1973 ▶). Acta Cryst. B29, 1630-1635]. In the crystal, the cations and chloride anions are linked into a he...