| Sulfur trioxide, compd. with pyridine (1:1) |
| Pyridine, compd. with sulfur trioxide (1:1) |
| sulfur trioxide pyridine complex |
| Pyridine sulfur trioxide |
| Salfurtrioxide pyri-dine complex |
| pyridine sulfur trioxide complex |
| Pyridine,compd. with sulfur trioxide(1:1) |
| Pyridine-sulfur trioxide |
| Sulfur trioxide,compd. with pyridine(1:1) |
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