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https://www.selleckchem.com/pr....oducts/Tranilast.htm
In solution, in the presence of oxygen, the triplet state decays almost exclusively by oxygen quenching, and singlet oxygen is produced in high yield (Φ∆ ≈ 0.5-0.55). The triplet state absorbs across the 450-750 nm region with maxima around 480 and 650 nm, and moderate molar absorption coefficients (ca. 6000-8000 M-1 cm-1). In a glass at 77 K, triplet decay gives a red phosphorescence, with λmax ≈ 640-650 nm, and a  ≈ 0.25 s lifetime. If singlet oxygen yields are a good indication of triplet yields, then internal conversion and inters
