1-Dearginyl-2,4-deprolyl-3-delysine-substance P 1-Des-arg-2,4-des-pro-3-des-lys-substance P 51165-09-4 Spcthp Substance P (5-11) Substance P C-terminal heptapeptide Substance P, 1-de-L-arginine-2-de-L-proline-3-de-L-lysine-4-de-L-proline- Substance P, dearginyl(1)-deprolyl(2,4)-delysine(3)-