1-Dearginyl-2-deprolyl-3-delysine-substance P 1-Des-arg-2-des-pro-3-des-lys-substance P 53749-60-3 SP(4-11) Substance P (4-11) Substance P (peptide), 1-de-L-arginine-2-de-L-proline-3-de-L-lysine- Substance P octapeptide Substance P, dearginyl(1)-deprolyl(2)-delysine(3)-