An antineoplastic antimetabolite with immunosuppressant properties. It is an inhibitor of tetrahydrofolate dehydrogenase and prevents the formation of tetrahydrofolate, necessary for synthesis of thymidylate, an essential component of DNA.

Methotrexate
| Description | |
|---|---|
| (2S)-2-[(4-{[(2,4-Diaminopteridin-6-yl)methyl](methyl)amino}benzoyl)amino]pentanedioic acid | |
| 59-05-2 | |
| C20H22N8O5 | |
| METHOTREXATE;METHYLAMINOPTERIN;METHYLAMINOPTERINE;ANTIFOLAN;L-(+)-AMETHOPTERIN;4-AMINO-N 10-METHYLPTEROYL-L-GLUTAMIC ACID;4-AMINO-10-METHYLPTEROYLGLUTAMIC ACID;(+)-4-AMINO-10-METHYLFOLIC ACID | |
| A deuterated folic acid antagonist | |