Stable polymorph of morphineCAS number: 57–27–2.

Gelbrich, T.; Braun, D.E.; Griesser, U.J.

doi:10.1107/S1600536812048945

Figure 2 Hydrogen bonded helical chain. Intramolecular and intermolecular O-H

O bonds are drawn as broken lines; H and O atoms involved in hydrogen bonding are are drawn as balls [symmetry code: (i) -x, y + $[{1\over 2}]$ , -z + $[{3\over 2}]$ .].