cysteinyl-phenylalanyl-tryptophyl-tryptophyl-lysyl-threonyl-phenylalanyl-N-ethylglycinamide cyclic (1-8-C2-ethyl)-disulfide
cysteinyl-phenylalanyl-tryptophyl-tryptophyl-lysyl-threonyl-phenylalanyl-n-ethylglycinamide cyclic (1-8-c2-ethyl)-disulfide