Noun
English Wikipedia has an article on:isoquinolineWikipedia
isoquinoline (plural isoquinolines)
(organic chemistry) An isomer of quinoline, many of whose derivatives occur as alkaloids and are synthesized for use as dyes, pharmaceuticals etc.
So, galantamine and homoaporphines do not contain isoquinoline fragment, but are, in general, attributed to isoquinoline alkaloids. Source: Internet
Such term does not include the isoquinoline alkaloids of opium. Source: Internet