Comparative pharmacology of levorphan, racemorphan and dextrorphan and related methyl ethers.
D003917:Dextrorphan; D007981:Levorphanol; D008738:Methyl Ethers; D009022:Morphine Derivatives
D008738:Methyl Ethers; D009022:Morphine Derivatives; D003917:Dextrorphan; D007981:Levorphanol
MORPHINE/derivatives