Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 98-29-3, Whether you call it 4-tert-Butylcatechol, 4-(1 -1-Dimethylethyl)-1 -2-benzenediol , TBC or 4-tert-Butylpyrocatechol you can be assured the 4-tert-Butylcatechol products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.