1-Arg-7,9-trp-11-leu-substance P 91224-37-2 L-Leucinamide, D-arginyl-L-prolyl-L-lysyl-L-prolyl-L-glutaminyl-L-glutaminyl-D-tryptophyl-L-phenylalanyl-D-tryptophyl-L-leucyl- Spantide Spantide I Substance P, 1-D-arginine-7-D-tryptophan-9-D-tryptophan-11-D-leucine- Substance P, arg(1)-trp(7,9)-leu(11)- Substance P, arginyl(1)-tryptophyl(7,9)-leucine(11)-