NOVELTY - Cucurbituril compound is new.    USE - Cucurbituril compound for storing gas selected from hydrogen, nitrogen, oxygen, argon, xenon, sulfur hexafluoride, nitric oxide, nitrous oxide, hydrogen sulfide, sulfur dioxide, chlorine, krypton, propene, isobutylene, butadiene, isoprene, terpene, methane, ethane, propane, butane, isobutene, acetylene, carbon dioxide or carbon monoxide (all claimed).    ADVANTAGE - The cucurbituril compound has thermally stable polymorphic crystalline structure.    DETAILED DESCRIPTION - The cucurbituril compound is represented by chemical formula (I).    A1 and A2=H, hydroxyl, substituted or unsubstituted 1-30C alkyloxy, 1-30C alkenyloxy, 1-30C alkynyloxy, 2-30C carbonylalkyloxy, 1-30 thioalkyloxy, 1-30 alkylthioloxy, 1-30C hydroxyalkyloxy, 1-30C alkyl silyloxy, 1-30C aminoalkyloxy, 1-30 thioalkyloxy, 5-30C cycloalkyloxy, 5-30 heterocycloalkyloxy, 6-30C aryloxy, 6-20C arylalkyloxy, 4-30C heteroaryloxy, 4-20C heteroaryl alkyloxy, 1-30C alkylthio, 1-30 alkenylthio, 1-30C alkynylthio, 2-30C carbonylalkylthio, 1-30C thioalkylthio, 1-30C hydroxyalkylthio, 1-30 alkylsilylthio, 1-30C aminoalkylthio, 1-30C aminoalkylthioalkylthio, 5-30C cycloalkylthio, 5-30C heterocycloalkylthio, 6-30C arylthio, 6-20C arylalkylthio, 4-30C heteroarylthio, 4-20C heteroaryl, 1-30C alkylamine, 1-30C alkenylamine, 1-30C alkynylamine, 2-30C carbonylalkylamine, 1-30C thioalkylamine, 1-30C hydroxyalkylamine, 1-30C alkylsilylamine, 1-30C aminoalkylamine, 1-30C aminoalkylthioalkylamine, 5-30C cycloalkylamine, 5-30C heterocycloalkylamine, 6-30C arylamine, 6-20C arylalkylamine, 4-30C heteroarylamine or 4-20C heteroarylalkylamine group; and    n=an integer of 4 to 12.    INDEPENDENT CLAIMS are included for:    (1) a method for preparing cucurbituril compound;    (2) a method for storing gas in cucurbituril compound; and    (3) a method for removing gas from cucurbituril compound.    DESCRIPTION OF DRAWING(S) - The drawing shows a graphical representation depicting adsorption isotherm of cucurbituril compound for hydrogen. (Drawing includes non-English language text).