1-Methyl-2a,3,4,5-tetrahydrobenz(c,d)indol-2(1H)-one 2a,3,4,5-Tetrahydro-1-methylbenz(cd)indol-2(1H)-one 89170-79-6 BRN 4425511 Benz(cd)indol-2(1H)-one, 2a,3,4,5-tetrahydro-1-methyl-