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D03 Heterocyclic Compounds D006571 +
D03.132 Alkaloids D000470 +
D03.132.610 Opium D009892 +
D03.132.610.422 Morphinans D009019 +
D03.132.610.422.413 Levallorphan D007977
D03 Heterocyclic Compounds D006571 +
D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
D03.549.686 Morphinans D009019 +
D03.549.686.429 Levallorphan D007977
D03 Heterocyclic Compounds D006571 +
D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
D03.605.497 Morphinans D009019 +
D03.605.497.429 Levallorphan D007977