322 Journal of Medicinal Chemistry, 1987, Vol. 30, No. 2 carboxamide) and decreased with further lengthening of the carbon chain. The immediate inferior (24) and superior (32) homologues of the clinically active compound 25 were at least 10-fold less active in the yohimbine test. Certain cyclic carboxamides were synthesized to see whether the steric hinderance had any effect on the potency. The activity of these derivatives (36-38) was ...