1,2,3,4-Tetrahydro-1',3,3,5-tetramethylspiro[γ-carboline-1,4'-piperidine];2',3',4',5'-Tetrahydro-1,3',3',5'-tetramethylspiro[piperidine-4,1'-[1H]pyrido[4,3-b]indole]
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