structures were thus selected because of the noncoplanar arrangement of their benzene rings, and an alkylamide chain was introduced to fit the requirements for MLT receptor binding, namely, dibenzocycloheptenes with an acylaminoalkyl sidechain at position 10 and dibenzoazepines with this sidechain originating from the nitrogen atom bridging the two phenyl rings. Binding affinity at human cloned MT1 and