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Vendor evaluation checklist Before purchasing from any online source, work through this checklist: Batch-specific COA available with HPLC and mass spec data Purity documented above 98% via HPLC Mass spectrometry confirming correct molecular weight (4,731.4 g/mol) Third-party testing results available or offered Clear labeling as research use only Verifiable business identity and contact information Consistent pricing with market averages Proper shipping conditions (temperature-controlled when necessary) Return or replacement policy for quality issues Responsive customer service that can answer technical questions Checking every item does not guarantee a perfect product, but it eliminates the most common sources of quality problems

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S8), although this substrate substantially degrades when added to the reaction buffer

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