4-Nitrophenyl trifluoroacetate 658-78-6 Acetic acid, trifluoro-, 4-nitrophenyl ester Acetic acid, trifluoro-, p-nitrophenyl ester EINECS 211-524-6 NSC 93909 Trifluoroacetic acid p-nitrophenyl ester p-Nitrophenyl trifluoroacetate