“…According to our computations this is definitely the case; i.e., the revised structure, shown in Figure , contains the hydroxy 1,2-dioxolane moiety. While this exact revised structure is not known, somewhat similar dimeric peroxyhemiacetals, xylopidimers C and E, and vielopsides A–C were recently isolated from a related species Xylopia vielana. To better understand the energetics of the open and closed forms in these species, we subjected the truncated β-lactol and its peroxy counterpart to DFT calculations at the B3LYP/6-311+G(d,p) level, shown in Figure .…”