Tricyclic Pyrazoles. 3. Synthesis, biological evaluation, and molecular modeling of analogues of the cannabinoid antagonist 8-chloro-1-(2',4'-dichlorophenyl)-N-piperidin-1-yl-1,4,5,6- tetrahydrobenzo[6,7]cyclohepta[1,2-c]pyrazole-3-carboxamide