VESPER (PT-141/Oxytocin)

Product Name: VESPER (PT-141 / Oxytocin Blend) – (Aqueous solution)

Chemical Information:

• PT-141
  • Chemical Name: Bremelanotide
  • Molecular Formula: C₅₀H₆₈N₁₄O₁₀
  • Molecular Weight: ~1025.2 g/mol
  • Sequence: Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH
  • Compound Class: Synthetic cyclic heptapeptide
• Oxytocin
  • Molecular Formula: C₄₃H₆₆N₁₂O₁₂S₂
  • Molecular Weight: ~1007.2 g/mol
  • Sequence: Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂ (cyclic; Cys¹–Cys⁶ disulfide bridge)
  • Compound Class: Synthetic cyclic nonapeptide
• Structure Class: Synthetic multi-peptide research blend

Product Description:

VESPER is a research formulation consisting of two structurally defined synthetic peptide components: PT-141 and Oxytocin. Each component is produced through controlled synthesis and combined in a standardized formulation for use in laboratory research environments. Both components are cyclic peptides, and the blend is studied in controlled experimental settings for analytical evaluation of peptide behavior, stability, and interaction within defined systems. This product is supplied as a pre-formulated aqueous research solution, intended exclusively for laboratory research use. The components are supplied as a combined reference solution to support analytical work requiring both peptides in a single defined preparation — including chromatographic resolution of co-formulated cyclic peptides, comparative stability profiling under identical solution conditions, and method development for multi-analyte quantification.

Research Applications:

• Analytical evaluation of peptide structure and composition within multi-component systems
• Examination of stability and degradation profiles of combined peptide formulations
• Comparative evaluation of cyclic peptide structures under controlled experimental conditions
• Investigation of peptide behavior in biochemical and in vitro assay environments

Storage and Handling:

• For optimal stability, store sealed product in a cool, dark, and dry environment. Refrigeration at 2–8 °C is recommended after first puncture or once the seal has been compromised
• Do not freeze
• Protect from light
• Handle using aseptic laboratory techniques

Product Specifications:

• Formulation: Aqueous solution
• Concentration: 1 mg/mL (PT-141); 0.167 mg/mL (Oxytocin)
• Total Content: 15 mg PT-141 / 2.5 mg Oxytocin per bottle
• Volume: 15 mL
• Container Format: Sealed metered dispenser (15 mL)
• Aliquot Volume (typical): ~150 µL per actuation (metered at 150 µL ±5%)
• Calculated Content per Aliquot: ~150 mcg PT-141 / ~25 mcg Oxytocin (derived from stated concentrations and aliquot volume)
• Analytical Approach to Finished Formulations: Purity is a metric used for isolated raw materials, such as lyophilized peptide powders. Finished formulations—such as capsules, liquids, and topicals—contain multiple components, including excipients and stabilizers. In these systems, a single purity value does not accurately represent the overall composition. Instead, identity and assay (content) are reported on the COA to confirm the presence of the correct compound and to verify that the labeled amount per unit is accurate. This approach reflects standard analytical practice and provides more meaningful information for research applications.

Compliance Notice:

VESPER is FOR RESEARCH USE ONLY as an analytical reference material. This product contains two components that correspond structurally to active pharmaceutical ingredients of FDA-approved products: PT-141 (bremelanotide), the active ingredient of Vyleesi®, and Oxytocin, the active ingredient of Pitocin®. This research material is not the approved drug product, is not manufactured under GMP conditions, is not equivalent to or a substitute for any approved pharmaceutical product, is not intended for human or veterinary use, and has not been independently evaluated by the FDA as a research compound. Buyers are solely responsible for determining the legality of this compound in their jurisdiction, including compliance with the Federal Analog Act (21 U.S.C. § 813) and any applicable state analog statutes. Misuse of this product is strictly prohibited and may violate federal, state, or local laws. By purchasing this product, buyer represents and warrants that it will be used only for in vitro research purposes.