Synonyms: 2-Oxetanone,4-isopropylidene-3,3-dimethyl- (8CI); 3-Pentenoic acid,3-hydroxy-2,2,4-trimethyl-,β-lactone (7CI); 2,2,4-Trimethyl-3-hydroxy-3-pentenoic acid lactone;2,2,4-Trimethyl-3-hydroxy-3-pentenoic acid, β-lactone; 2,2,4-Trimethylpent-3-en-3-olide;3-Hydroxy-2,2,4-trimethyl-3-pentenoic β-lactone; Dimethylketene dimer;β-Lactone of 2,2,4-Trimethyl-3-hydroxy-3-pentenoic acid