isoquinoline

noun
iso·​quin·​o·​line | \ ˌī-sō-ˈkwin-ᵊl-ˌēn How to pronounce isoquinoline (audio) \

Medical Definition of isoquinoline

: a low-melting nitrogenous base C9H7N that is associated with its isomer quinoline in coal tar and that is the parent structure in many alkaloids (as narcotine and papaverine)