has role has functional parent is enantiomer of levomethorphan 6-methoxy-11-methyl-1,3,4,9,10,10a-hexahydro-2H-10,4a-(epiminoethano)phenanthrene oneirogen dextrorphan xenobiotic dextromethorphan CHEBI:4470 A 6-methoxy-11-methyl-1,3,4,9,10,10a-hexahydro-2<em>H</em>-10,4a-(epiminoethano)phenanthrene in which the sterocenters at positions 4a, 10 and 10a have <i>S</i>-configuration. It is a prodrug of dextrorphan and used as an antitussive drug for suppressing cough. prodrug neurotoxin antitussive NMDA receptor antagonist environmental contaminant