4,4 inverted exclamation marka-Isopropylidenediphenol-13C12;(4,4'-Dihydroxydiphenyl)dimethylmethane-13C12;Bisphenol A-(rings-13C12);Bisphenol A-13C12;4,4'-(1-Methylethylidene)bisphenol-13C12;2,2-Bis(4-hydroxyphenyl-13C6)propane;4,4'-Isopropylidenediphenol-13C12;2,2-Bis(4-hydroxyphenyl)propane-13C12