(+)-(S,S)-1,3-Bis[(tetra­hydro­furan-2-yl)­meth­yl]thio­urea

The title compound, C(11)H(20)N(2)O(2)S, is an enanti­omerically pure heterocycle-substituted thio­urea synthesized under solvent-free conditions. The thio­urea unit adopts a ZZ conformation, with the HN—(C=S)—NH core almost planar and the tetra­hydro­furfuryl groups placed below and above this plane. The whole mol­ecule thus approximates to noncrystallographic C (2) symmetry. Unexpectedly, the C=S group is not involved in inter­molecular hydrogen bonding, as generally observed in homodisubstituted thioureas. Instead, mol­ecules form a one-dimensional network based on weak N—H⋯O(heterocycle) hydrogen bonding, resulting in a zigzag ribbon-like structure around the crystallographic 2(1) screw axis along [100].