Pharma-Grade THF is a colorless, water‑miscible cyclic ether (CAS No. 109‑99‑9; formula C₄H₈O; MW ≈ 72.1 g/mol) offered at ≥ 99.9% purity, often anhydrous and stabilizer-free, with ultra-low water and peroxide content. It meets stringent pharma/lab quality with strong documentation for reproducibility.