N-methyl-N-nitroso-p-toluenesulfonamide /ɛn ˈmɛθɪl ɛn naɪˈtroʊsoʊ piː təˈluːiːn ˌsʌlfoʊˈnæmaɪd/ noun1 •A nitrosamide compound used in laboratories as a precursor for producing diazomethane, a reactive methylating agent in organic synthesis.