[4-(5-Ethyl-10-methyl-11-oxo-10,11-dihydro-5H-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-7-yl)-phenyl]-carbamic acid tert-butyl 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
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-7-(3-methoxy-phenyl)-10-methyl-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a,d]cyclohepten-11-one