Abstract
Several regioisomeric tetrazolyl indole derivatives with structurally modified alkyl substituents at the tetracyclic indole nitrogen containing N-ethyl amino tetrazole moiety have been synthesized and screened for their ER binding affinity, agonist (estrogenic), antagonist (antiestrogenic) and anti-implantation activities. N-2 regioisomers were found to be moderately antagonists and one compound showed 100% contraceptive efficacy at 10 mg/kg dose. Molecular docking studies carried out in comparison to estradiol and raloxifene showed different binding modes of the two regioisomers to the binding site.
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