Acyclic polyalcohols, acyclic carbohydrates and inositol. In the linear compounds, C1 is at the topmost position of the carbon chain; the aldehyde and ketone functionalities at C1 and C2 in D-allose and D-psicose, respectively, are in bold italics. In inositol, the C1 and C2 position are indicated with 1 and 2, respectively. Those compounds not designated with a D are meso compounds.