The helical tubulands are a group of alicyclic dialcohols whose inclusion compounds crystallise in the chiral space group P3121 (or enantiomorph P3221) with a hydrogen bonded network structure containing parallel guest-filled tubes. Protic organic guest molecules are also included within these host tubes, with the exception of phenols which form co-crystalline adducts. The diol 3 includes non-protic guests within the usual tubular lattice, but forms a 1∶1 adduct with hydroquinone in space group C2/c whose crystal structure is entirely different from typical diol–phenol compounds like (2)2·(hydroquinone) in space group P21/c. Unexpectedly, diol 3 also forms the unprecedented co-crystalline diol–alcohol compound (3)·(methanol). This substance does have close structural similarities to the earlier co-crystalline diol–phenol compounds in space group P21/c.