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)
pixantrone [ 5,8-bis((2-aminoethyl)amino)-2-aza-anthracene-9,10-dione,6,9-AEA-BIQDO,5,8-bis(2-aminoethylamino)-2-azaanthracene-9,10-dione,6,9-bis((2-aminoethyl)amino)benzo(g)isoquinoline-5,10-dione,BBR 2778,BBR-2778,BBR2778 ] an immunosuppressant; structure given in first source