CAS Number: 129176-97-2 Molecular Weight: 1667.7 Salt Form: TFA Purity: >96% Sequence (3-letter): e-nicotinoyl-D-Lys-Pro-3Pal-Pro-(3,4Cl)D-Phe-Asn-D-Trp-Phe-D-Trp-Leu-Nle-NH2 (3Pal = 3-pyridylalanine) Sequence (1-letter): (e-nicotinoyl)kP(3Pal)P((3,4Cl)D)FNwFwL(Nle)-NH2 Storage: -20 ?C or below Solubility: water (1 mg/mL) Spantide II is an undecapeptide substance P (SP) analog that is more potent as a substance P antagonist than spantide I and less effective in releasing histamine from mast cells. It is a neurokinin-1 receptor (NK-1R) antagonist that is used to control inflammation, particularly in skin conditions, and has negligible neurotoxicity.