No abstract available
MeSH terms
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Analgesics* / antagonists & inhibitors
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Analgesics* / chemical synthesis
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Animals
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Chemical Phenomena
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Chemistry
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Codeine
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Heroin
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Humans
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Hydromorphone
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Levorphanol
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Meperidine
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Methadone
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Morphinans
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Morphine Dependence
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Structure-Activity Relationship
Substances
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Analgesics
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Morphinans
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Levorphanol
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Heroin
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Meperidine
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Hydromorphone
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Methadone
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Codeine