The molecule is a 6-methoxy-11-methyl-1,3,4,9,10,10a-hexahydro-2H-10,4a-(epiminoethano)phenanthrene in which the stereocenters at positions 4a, 10 and 10a have R-configuration. It is a prodrug of levorphanol and a strong narcotic analgesic, and listed as a schedule II controlled substance. It has a role as an opioid analgesic and a prodrug. It derives from a Levorphanol. It is an enantiomer of a dextromethorphan.
(1R,9R,10R)-4-methoxy-17-methyl-17-azatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-triene