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US2493038A   [0003] 
US20050070614A   [0003] 
WO2007136425A2   [0003]  [0010] 
EP3071549A1   [0003]  [0010] 
WO2018208701A1   [0003]  [0003] 
EP19176382A   [0003]  [0003] 

The reaction of methanesulfonic acid with sulfur trioxide   [0003]