Synonyms: SULFUR TRIOXIDE DIMETHYLFORMAMIDE COMPLEX;SULFUR TRIOXIDE N,N-DIMETHYLFORMAMIDE COMPLEX;N,N-DIMETHYLFORMAMIDE SULFUR TRIOXIDE COMPLEX;n,n-dimethyl-formamidcompd.withsulfurtrioxide(1:1);N,N-dimethylformamide, compound with sulphur trioxide;Sulphur trioxide N,N-dimethylformamide complex;Sulfur trioxide N,N-dimethylformamide complex,47+% active SO3