3,3,5,5,-d4-Morpholine is a labelled form of Morpholine (M723725). Morpholine is used as selective inhibitors of cytochrome p450 2a13 in treatment of cancer. Morpholine is a building block in the preparation of the antibiotic Linezolid (L466500), the anticancer agent Gefitinib (G304000) and the analgetic Dextromoramide (M630190).