2H-Perfluoro-2-methylpropanoic acid2-(Trifluoromethyl)-3,3,3-trifluoropropionic acid3,3,3-Trifluoro-2-(trifluoromethyl)propionic acid3,3,3-Trifluoro-2-(trifluoromethyl)propanoic acid3,3,3-三氟-2-(三氟甲基)丙酸3,3,3-Trifluoro-2-(trifluoromethyl)propionic acid