Figure 1

Structure of 6,7,8,9-tetrahydro-N,N,-di-n-propyl-1H-benz [g]indole-7-amine (PBIA), 1-p-toluenesulfonyl-6,7,8,9-tetrhydro-N,N-di-n-propyl-1H-benz [g]indol-7-amine (TPBIA) and 5-OH-DPAT