| 21. | "' Allylprodine "'is an opioid analgesic that is an analog of prodine.
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| 22. | "' Prosidol "'is an opioid analgesic that is an analogue of prodine.
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| 23. | It is one of the most effective orally-administered opioid analgesics and has a wide safety margin.
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| 24. | "' 3-Acetyloxymorphone "'is an opioid analgesic which has never been marketed.
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| 25. | "' Clonitazene "'is an opioid analgesic of approximately three times the potency of morphine.
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| 26. | "' Cyclorphan "'is an opioid analgesic of the morphinan family that was never marketed.
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| 27. | "' Norlevorphanol "'is an opioid analgesic of the morphinan family that was never marketed.
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| 28. | "' 4-Phenylfentanyl "'is an opioid analgesic that is a derivative of fentanyl.
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| 29. | "' Volazocine "'is an opioid analgesic of the benzomorphan class which was never marketed.
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| 30. | "' Carbazocine "'is an opioid analgesic of the benzomorphan family which was never marketed.
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