91464-97-0 H 261 H 261 Oligopeptide H-261 H-261 Oligopeptide L-Histidine, L-histidyl-L-prolyl-L-phenylalanyl-L-histidyl-(2S,4S,5S)-5-amino-4-hydroxy-7-methyl-2-(1-methylethyl)octanoyl-L-isoleucyl- L-Histidine, N-(N-(5-((N-(N-(1-L-histidyl-L-prolyl)-L-phenylalanyl)-L-histidyl)amino)-4-hydroxy-7-methyl-2-(1-methylethyl)-1-oxooctyl)-L-isoleucyl)-, (2S-(2R*,4R*,5R*))- his-pro-phe-his-leu(OH)-val-ile-his