Sulfur trioxide, compd. with pyridine (1:1);Sulphur trioxide pyridine (1:1);Pyridine sulfotrioxide;Pyridine-sulfur trioxide complex;Pyridine SO3 (1:1) complex;Pyridine, compd. with sulfur trioxide (1:1) (8CI)(9CI);Pyridine compound with sulfur trioxide (1:1);Pyridine sulfur trioxide complex;
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