ETA receptor antagonist [BQ-123] . sodium salt Highly potent and selective ETA antagonist.Product SpecificationSequence: cyclo(D-Asp-Pro-D-Val-Leu-D-Trp . Na) Formula: C31H42N6O7 . Na MW: 633.7 CAS: 136553-81-6 Quantity: *Sold as net peptide weight. Purity: ≥96% Solubility: Soluble in water. Long Term Storage: -20°C Use/Stability: Stable for at least 3 years after receipt when stored at -20°C. Stock solutions are stable for up to 3 months when stored at -20°C.