116387-59-8 3H-Dibenz(f,ij)isoquinoline-1-carbonitrile, 6-bromo-2,7-dihydro-3-methyl-2,7-dioxo- 6-Bromo-2,7-dihydro-3-methyl-2,7-dioxo-3H-dibenz(f,i,j)isoquinoline-1-carbonitrile