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The title compound, C 22 H 22 OS [systematic name: 4-(1,3,3-trimethyl-2,3-di-hydro-1 H -4-thia-phenanthren-1-yl)phenol], crystallizes unsolvated from nitro-methane as colourless prisms (m.p. 425-427 K) in the polar monoclinic space group Ia with Z ' = 2 (mol-ecules A and B ). Both independent mol-ecules possess a very similar proximal conformation, this referring to the juxtaposition of the 4-hy-droxy-phenyl substituent with respect to the syn -related methyl group. In the crystal, mol-ecule A is linked to mol-ecule B by an O-H⋯O hydrogen bond. In turn, mol-ecule B exhibits a weak O-H⋯π inter-action with the phenolic group of mol-ecule A related by a -glide symmetry. Together, these lead to [100] chains.

4-(4-Hydroxyphenyl)-2,2,4-trimethyl-7,8-benzothiachroman, a fused-ring counterpart ofthia-Dianin's compound