.alpha.-Bromo-.gamma.-butyrolactone .alpha.-Bromobutyric acid, .gamma.-lactone .alpha.-Bromobutyrolactone 2(3H)-Furanone, 3-bromodihydro- 2-Bromo-.gamma.-butyrolactone 2-Bromo-4-butanolide 2-Bromobutyrolactone 3-Bromo-2-furanone 5061-21-2 NSC56959