Exatecan, a potent topoisomerase I inhibitor crucial for anticancer drug development, exists in various chemical forms, notably as Exatecan free base and Exatecan mesylate. Understanding the distinctions between these forms is vital for R&D scientists when they 'buy Exatecan' for specific research applications. The choice between these forms can impact solubility, stability, and suitability for different experimental protocols.

Exatecan free base (often with CAS numbers like 169869-90-3 or 171335-80-1 for the free base) is the neutral form of the molecule. It's fundamental for many synthetic processes and certain analytical studies. However, the free base may exhibit lower solubility in aqueous media, which can be a limitation for in vitro assays requiring aqueous buffers. Researchers might need to 'purchase Exatecan' free base for specific conjugation reactions or when working with organic solvents.

Exatecan mesylate, on the other hand, is the salt form. While not explicitly detailed in the provided source material with a specific CAS for the mesylate of 171335-80-1, mesylate salts are commonly used in pharmaceuticals to enhance water solubility and bioavailability. If a specific mesylate CAS is required, such as 197720-53-9 for mesylate dihydrate, it indicates a form optimized for biological applications where aqueous solubility is paramount. Companies looking for a ready-to-use formulation for cell-based assays might prefer the mesylate salt.

When sourcing Exatecan, identifying a reliable 'Exatecan supplier' that clearly labels the chemical form and provides accurate CAS numbers is essential. 'Exatecan manufacturers in China' and other global suppliers offer both forms, catering to diverse research needs. The 'Exatecan price' can also vary between the free base and its salt forms, reflecting differences in manufacturing complexity and intended applications.

For researchers, it's important to clarify the exact form of Exatecan they need. If your research involves organic synthesis or requires specific reaction conditions where the free base is preferred, then sourcing 'Exatecan CAS 171335-80-1' (referring to the free base) is appropriate. Conversely, if enhanced aqueous solubility is critical for in vitro studies, investigating available Exatecan mesylate products from your chosen 'Exatecan supplier' would be the next step. Always confirm the CAS number and form when you 'buy Exatecan' to ensure it aligns with your project requirements.

In conclusion, both Exatecan free base and Exatecan mesylate are valuable for cancer research. Understanding their chemical properties and availability from trusted suppliers is key to making informed purchasing decisions and advancing your drug development endeavors.