Perfluorooctanoic acid335-67-131 % similar Perfluorodecanoic acid335-76-231 % similar Perfluoroheptanoic acid375-85-931 % similar Perfluorononanoic acid375-95-131 % similar Perfluorotetradecanoic acid376-06-731 % similar Perfluorohexadecanoic acid67905-19-531 % similar 1,2-Dichloro-3,3,4,4,5,5-hexafluorocyclopentene706-79-630 % similar