Propofol EP Impurity B Catalogue B485422 CAS 74926-89-9 M.W 176.25 M.F C12H16O Specifications FAQs 2-Isopropenyl-6-isopropylphenol; 2-(1-methylethenyl)-6-(1-methylethyl)phenol; 2-isopropyl-6-(prop-1-en-2-yl)phenol