(E)-2,4,7-Trichloro-3-hydr­oxy-8-meth­oxy-1,9-dimethyl-6-(1-methyl-1-propen­yl)-11H-dibenzo[b,e][1,4]dioxepin-11-one monohydrate (nidulin monohydrate)

In the title compound, C20H17Cl3O5·H2O, the nidulin mol­ecule consists of three rings, the folded central dioxepin-11-one ring being fused on both sides to phenyl rings. The mol­ecular structure is stabilized by intra­molecular O—H⋯Cl and C—H⋯Cl hydrogen bonds that generate S(6) ring motifs. The crystal structure is stabilized by inter­molecular O—H⋯O and O—H⋯(O,O) hydrogen bonds mediated by two inversion-related water mol­ecules, generating R 4 2(8) ring and C 2 2(4) chain motifs. Weak inter­molecular Cl⋯O halogen bonds are also present with Cl⋯O distances of 3.071 (1) and 3.182 (2) Å