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phe·nol·sul·fon·ic acid
variants:
or chiefly British phenolsulphonic acid \ ˌsəl-ˈfän-ik, -ˈfōn- 
\
\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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