Crystal structure of 2-oxo-1,2-di­phenyl­ethyl diiso­propyl­carbamate

The title compound, C(21)H(25)NO(3), crystallized as a racemic twin in the Sohnke space group P2(1). In the mol­ecular structure of the title compound, both enanti­omers show a highly similar conformation with the urethane function and the benzoyl group showing an almost perpendicular arrangement [the dihedral angle is 72.46 (8)° in the S-enanti­omer and 76.21 (8)° in the R-enanti­omer]. In the crystal structure, mol­ecules of both enanti­omers show infinite helical arrangements parallel to the b axis formed by weak C—H⋯O hydrogen bonds between the phenyl ring of the benzoyl group and the carbamate carbonyl group. In case of the R-enanti­omer, this helix is additionally stabilized by a bifurcated hydrogen bond between the carbonyl function of the benzoyl group towards both phenyl groups of the mol­ecule.