Definition: A group of compounds with the heterocyclic ring structure of benzo(c)pyridine. The ring structure is characteristic of the group of opium alkaloids such as papaverine. (From Stedman, 25th ed)
PK 14105 [ 1-(2-fluoro-5-nitrophenyl)-N-methyl-N-(1-methylpropyl)-3-isoquinolinecarboxamide,3-Isoquinolinecarboxamide, 1-(2-fluoro-5-nitrophenyl)-N-methyl-N-(1-methylpropyl)-,PK-14105 ] structure given in first source