quinidine

A colorless crystalline alkaloid, C₂₀H₂₄N₂O₂, resembling quinine and used in treating malaria and cardiac arrhythmias.

A base (C₂₀H₂₄N₂O₂) isomeric with quinine, and occurring associated with it in some cinchona barks.

An alkaloid isomeric with, and resembling, quinine, found in certain species of cinchona, from which it is extracted as a bitter white crystalline substance; conchinine. It is used somewhat as a febrifuge.

An isomer of quinine that is used as an antiarrhythmic agent

cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias