5-Ethyl-7-(6-methoxy-pyridin-3-yl)-10-methyl-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-11-one

7-[4-(tert-Butyl-dimethyl-silanyloxy)-phenyl]-5-ethyl-10-methyl-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-11-one

5-Ethyl-10-methyl-7-(1-triisopropylsilanyl-1H-pyrrol-3-yl)-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-11-one

Trifluoro-methanesulfonic acid 5-cyclopropyl-10-methyl-11-oxo-10,11-dihydro-5H-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-7-yl ester

7-(6-Benzylamino-pyridin-3-yl)-5-ethyl-10-methyl-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-11-one