Jacobson, of the National Institutes of health, Bethesda, MD, for analgesic evaluations and to Dr. J. H. Woods, The University of Michigan, for the rat brain membrane binding and vas deferens assays. Registry No. 1, 5965-16-2; 2, 101155-88-8; 3, 102977-05-9; 4, 102977-06-0; 4*oxalate, 103064-28-4; 4.HC1, 103064-35-3; 5, ... 102977-07-1; 5.HC1, 103064-29-5; 6, 102977-08-2; 6.HC1, 103064- 30-8; 7a, 102977-09-3; 7wHC1, 103064-31-9; 7b, ...