Morpholine (also known as 1-Oxa-4-azacyclohexane, Diethylene oximide, Tetrahydro-1,4-oxazine, Diethylenimide oxide, Diethyleneimide oxide, Diethylene imidoxide, Drewamine, Tetrahydro-2H-1,4-oxazine, Tetrahydro-p-oxazine or p-Isoxazine, tetrahydro-) is a substance of the morpholine class.