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ketanserin

n. A serotonin antagonist.

Wikipedia
Ketanserin

Ketanserin ( INN, USAN, BAN) (brand name Sufrexal; former code name R41468) is a drug used clinically as an antihypertensive agent and in scientific research to study the serotonin system; specifically, the 5-HT receptor family. It was discovered at Janssen Pharmaceutica in 1980.