127819-96-9 Cyclo(D-histidyl-L-prolyl-D-tryptophyl-L-isoleucyl-D-2-piperidinecarbonyl-L-2-piperidinecarbonyl) Cyclo(pro-trp-ile-pip-pip-his) Cyclo(prolyl-tryptophyl-isoleucyl-pipecolyl-pipecolyl-histidyl) L 366,682 L 366682 L-366682