(S)-4-(4-Hydro­xy­phenyl)-2,2,4-tri­methyl­chroman

The enantiomerically pure title compound, C₁₈H₂₀O₂, crystallizes with one mol­ecule in the asymmetric unit. The packing arrangement is significantly different from that of its racemate. Linear hydrogen-bonded chains are aligned along the [100] direction. Edge-to-face π–π interactions occur between adjacent hydrogen-bonded columns.

O-[4-(2,2,4-Trimethyl­chroman-4-yl)phen­yl] N,N-dimethyl­thio­carbamate

The title compound, C₂₁H₂₆NO₂S, was obtained during the synthesis of the thiol derivative of Dianin's compound. Unlike Dianin's compound and the thiol derivatives, the title compound revealed no strong hydrogen-bonding inter­actions.

1,1-Dibenzoyl-3,3-dimethyl­urea

The mol­ecules of 1,1-dibenzoyl-3,3-dimethyl­urea, C₁₇H₁₆N₂O₃, inter­act through an inter­molecular C—H...O hydrogen bond and several C—H...π inter­actions, resulting in a three-dimensional network.