... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > chalcogen molecular entity > oxygen molecular entity > organooxygen compound > carboxamide > monocarboxylic acid amide > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > chalcogen molecular entity > organochalcogen compound > organooxygen compound > carboxamide > monocarboxylic acid amide > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organochalcogen compound > organooxygen compound > carboxamide > monocarboxylic acid amide > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > nitrogen molecular entity > organonitrogen compound > carboxamide > monocarboxylic acid amide > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organonitrogen compound > carboxamide > monocarboxylic acid amide > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > nitrogen molecular entity > amide > primary amide > carboxamide > monocarboxylic acid amide > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > nitrogen molecular entity > organonitrogen compound > alkaloid > indole alkaloid > terpenoid indole alkaloid > hemiterpenoid indole alkaloid > ergot alkaloid > methysergide

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organonitrogen compound > alkaloid > indole alkaloid > terpenoid indole alkaloid > hemiterpenoid indole alkaloid > ergot alkaloid > methysergide