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Esmethadone
(S)-enantiomer of methadone From Wikipedia, the free encyclopedia
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Esmethadone (INN ; developmental code name REL-1017), also known as dextromethadone, is the (S)-enantiomer of methadone. It acts as an N-methyl-D-aspartate receptor (NMDAR) antagonist, among other actions.[1] Unlike levomethadone, it has low affinity for opioid receptors and lacks significant respiratory depressant action and abuse liability.[2][3] Esmethadone is under development for the treatment of major depressive disorder.[4] As of August 2022, it is in phase 3 clinical trials for this indication.[4]
There is an asymmetric synthesis available to prepare both esmethadone (S-(+)-methadone) and levomethadone (R-(−)-methadone).[5][6]
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