.gamma.-Caprolactone .gamma.-Ethyl-.gamma.-butyrolactone .gamma.-Ethylbutyrolactone .gamma.-Hexalactone .gamma.-Hexanolactone 2(3H)-Furanone, 5-ethyldihydro- 4-Hydroxyhexanoic acid lactone 6-Caprolactone 695-06-7 Hexanoic acid, 4-hydroxy-, .gamma.-lactone NSC24255