1,4-Dihydro-3(2H)-isoquinolinone (CAS No.24331-94-0), its synonyms are 1,4-Dihydro-2H-isoquinolin-3-one ; 3(2H)-Isoquinolinone, 1,4-dihydro- ; 1,2,3,4-Tetrahydroisoquinolin-3-one ; 1,2-Dihydroisoquinoline-3(4H)-one .