substance P (6-11) [ SP(6-11),1-dearginyl-2,4-deprolyl-3-delysyl-5-deglutamine-substance P,1-des-Arg-2,4-des-Pro-3-des-Lys-5-des-Gln-substance P,pGlu SPH,sendide,substance P hexapeptide,substance P, dearginyl(1)-deprolyl(2,4)-delysyl(3)-deglutamine(5)- ] C-terminal hexapeptide of substance P