... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > heterocyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > organic molecule > organic cyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > polyatomic entity > molecule > organic molecule > organic cyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > organic cyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organic heterocyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > heterocyclic compound > heteropolycyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > polycyclic compound > heteropolycyclic compound > organic heteropolycyclic compound > organic heterotetracyclic compound > varenicline

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > polycyclic compound > bridged compound > varenicline

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... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > nitrogen molecular entity > organonitrogen compound > organic amino compound > secondary amino compound > varenicline

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organonitrogen compound > organic amino compound > secondary amino compound > varenicline