Trifluoroacetyl trifluoromethanesulfonateTrifluoroacetyl trifluoromethanesulphonate 97%三氟乙酰基三氟甲磺酸酯三氟乙酰基三氟甲磺酸酐Trifluoroacetyl triflateTrifluoroacetic trifluoromethanesulfonic anhydride三氟乙酰三氟甲磺酸酐Trifluoroacetic acid, anhydride with trifluoromethanesulfonic acid