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phenolsulfonic acid

noun phe·nol·sul·fon·ic acid
variants: or chiefly British phenolsulphonic acid play \ˌsəl-ˈfän-ik, -ˈfōn-\
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medical Definition of phenolsulfonic acid

: a sulfonic acid derived from phenol; especially : a crystalline acid C6H6O4S used chiefly as an intermediate for dyes and pharmaceuticals

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