1,4-Dihydro-2-methyl-1,4-ethenoisoquinolin-3(2H)-one 1,4-Ethenoisoquinolin-3(2H)-one, 1,4-dihydro-2-methyl- 13131-19-6 N-Methyl-1,4-dihydro-1,4-etheno-isoquinolin-3(2H)-one