All
 D03 Heterocyclic Compounds D006571 +
 D03.132 Alkaloids D000470 +
 D03.132.610 Opium D009892 +
 D03.132.610.422 Morphinans D009019 +
 D03.132.610.422.106 Benzomorphans D001575 +
 D03.132.610.422.150 Buprenorphine D002047 
 D03.132.610.422.165 Butorphanol D002077 
 D03.132.610.422.235 Dextrorphan D003917 
 D03.132.610.422.250 Diprenorphine D004174 
 D03.132.610.422.270 Etorphine D005048 
 D03.132.610.422.413 Levallorphan D007977 
 D03.132.610.422.463 Levorphanol D007981 +
 D03.132.610.422.547 Morphine D009020 +
 D03.132.610.422.606 Nalbuphine D009266 
 D03.132.610.422.656 Nalorphine D009269 
 D03.132.610.422.706 Naloxone D009270 +