A 2754 (OTTO) N-Acetylsulfanilyl chloride, 98% Cas 121-60-8 - used in the synthesis of N1,N1-dimethylsulfanilamide as the internal standard in the reaction. A 2754 (OTTO) N-Acetylsulfanilyl chloride, 98% Cas 121-60-8 - used to determine tramadol and its O-desmethylated metabolite in blood plasma.