title: (3S)-14,16-Dihy-droxy-3-methyl-3,4,5,6,9,10,11,12-octa-hydro-1H-2-benzoxacyclo-tetra-decine-1,7(8H)-dione (zearalanone) monohydrate.
abstract: The absolute configuration of the title compound, C(18)H(24)O(5)·H(2)O, was not been determined by anomalous-dispersion effects, but has been assigned by reference to an unchanging chiral centre in the synthetic procedure. Intra-molecular O-H⋯O hydrogen bonds stabilize the mol-ecular conformation. In the crystal, O-H⋯O hydrogen bonds link the main mol-ecules and the water mol-ecules, forming an infinite three-dimensional network.
authors.affiliation: BAM Federal Institute for Materials Research and Testing, Department of Analytical Chemistry, Reference Materials, Richard-Willstätter-Strasse 11, D-12489 Berlin,  Germany.
authors.forename: Sarah
authors.initials: S
authors.lastname: Drzymala
authors.forename: Werner
authors.initials: W
authors.lastname: Kraus
authors.forename: Franziska
authors.initials: F
authors.lastname: Emmerling
authors.forename: Matthias
authors.initials: M
authors.lastname: Koch