Polyketomycin is a tetracyclic quinone glycoside antibiotic isolated from Streptomyces sp. or Streptomyces diastatochromogenes, has antibacterial, anticancer, antimalarial activities.
Aptazapine (CGS 7525A) is a tetracyclic antidepressant (TECA) that is a potent α2-adrenergic receptor antagonist and has also been shown to act as a 5-HT2 receptor antagonist and an H1 receptor reverse agonist, both for serotonin reuptake or norepinephrin
8-hydroxy Amoxapine is a metabolite of the tetracyclic antidepressant amoxapine .1,2 1.Johnson, S.M., Nygard, G., and Khalil, S.K.Isocratic liquid chromatographic method for the determination of amoxapine and its metabolitesJ. Pharm. Sci.73(5)696-699(1984) 2.Tasset, J.J., and Pesce, A.J.Amoxapine in human overdoseJ. Anal. Toxicol.8(3)124-128(1984)