hexano-6-lactone1,6-hexanolide1-Oxa-2-oxocycloheptane2-Oxepanone2-oxacycloheptanone2-oxohexamethylene oxide6-Hexanolide6-hexanolactone6-hydroxyhexanoic acid lactone6-hydroxyhexanoic acid, epsilon-lactonecaprolactoneepsilon-Caprolactoneepsilon-caprolactone monomerhexan-6-olidehexano-6-lactonehexanoic acid, epsilon-lactone