L-Tyrosine, L-tyrosyl-L-leucyl-L-leucyl-L-tyrosyl-L-tyrosyl-L-threonyl-L-a-glutamyl-L-phen ylalanyl-L-threonyl-L-prolyl-L-threonyl-L-a-glutamyl-L-lysyl-L-a-aspartyl-L-a- glutamyl-