122211-29-4 Cyclo(N-hydroxy-L-isoleucyl-D-hexahydro-3-pyridazinecarbonyl-L-hexahydro-3-pyridazinecarbonyl-N-methyl-D-phenylalanyl-L-prolyl-D-phenylalanyl) Cyclo(pro-phe-N-OH-ile-piperazinyl-piperazinyl-N-Me-D-phe) Cyclo(prolyl-phenylalanyl-N-hydroxyleucyl-piperazinyl-piperazinyl-N-methylphenylalanine) L 156,373 L 156373 L-156373