label: cucurbituril
label_lc: cucurbituril
description: "A macrocycle consisting of repeating  2,5-dioxodihydroimidazo[4,5-d]imidazole-1,3,4,6-tetrayl (glycoluril) units linked by methylene groups. The number of glycoluril units in the macrocycle is denoted by the \"n\" in cucurbit[n]uril name."