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(2007/10/02)perfluorobutanesulfonic acid
nonafluorobutanesulfonic phosphorodifluoridic anhydride
1,1,2,2,3,3,4,4,4-Nonafluoro-butane-1-sulfonic acid 2-(4-methoxy-phenyl)-cyclobut-1-enyl ester
((nonafluorobutanesulfonyl)ethynyl)benzene
2,2,2-trifluoroethyl 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate
4-methoxybenzil
α,α'-Bis(4-methoxybenzoyl)stilben