Perfluorododecanoic acid307-55-131 % similar 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 1,1,2,2-Tetrachloro-3,3,4,4-tetrafluorocyclobutane336-50-530 % similar