| http://www.w3.org/ns/prov#value | - CF2 ═CX1 (OCF2 CFX2)a Ob (CFX3)c SO2 X4 wherein X1 is F or CF3, X2 and X3 are F or C1 -C10 perfluoroalkyl, X4 is F, OH, OR1, OM and NR2 R3 (R1 is C1 -C10 alkyl, R2 and R3 are H or one of R1, and M is an alkali metal or quaternary ammonium), a is an integer of 0-3, b an integer of 0 or 1 and c an integer of 0-12.
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