Concomitant dimorphism and helical self-assembly in a C2h-symmetric ‘locked’ cyclitol

A conformationally locked C2h symmetric tetrol concomitantly crystallized in two polymorphic modifications, differing principally in the mode of molecular association by C–H⋯O hydrogen bonds; the non-centrosymmetric tetragonal polymorph exhibits two complementary helical molecular arrangements mediated by O–H⋯O and C–H⋯O hydrogen bonds.