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Dextromethadone is an antitussive opioid. It is the (S)-enantiomer of methadone.
D-Methadone acts as a N-methyl-D-aspartate NMDA receptor antagonist similar to Ketamine.
There is now an asymmetric synthesis available to prepare both dextromethadone [S-(+)-methadone] and levomethadone [R-(−)-methadone].
References
Dextromethadone Wikipedia(Text) CC BY-SA