(R)-2,2'-Bis[N'-(3,5-dichloro-phen-yl)ureido]-1,1'-binaphthalene chloro-form disolvate.

The title compound, C(34)H(22)Cl(4)N(4)O(2)·2CHCl(3), is a new urea based on the 1,1'-binaphthalene skeleton, which crystallizes with two mol-ecules of binaphthalene and four mol-ecules of chloro-form in the unit cell. The chloro-form solvent mol-ecules do not participate in non-covalent inter-actions and therefore, can be found in several positions. The binaphthalene mol-ecules are connected via a system of N-H⋯O hydrogen bonds between the ureido units. C-H⋯O inter-actions also occur. In contrast to unsubstituted urea, where mol-ecules form squares in crystals, the bulky substituents disturb this arrangement and three ureido groups form infinite chains, while the fourth inter-acts with a neighbouring binaphthalene ring via an N-H⋯π inter-action. The solvent molecules are disordered with occupancy ratios of 0.60:0.40, 0.58:0.42, 0.50:0.50 and 0.77:0.23.