110880-54-1 9-Pro-11-met(O2)-substance P 9-Prolyl-11-methionine(O2)-substance P Substance P, 9-L-proline-11-(4-(methylsulfonyl)-L-2-aminobutanamide)- Substance P, pro(9)-met(O2)(11)- Substance P, prolyl(9)-methionine(O2)(11)-