Reactive derivative of carboxylic acids (e.g., used to introduce chloromethyl groups).
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6-Methyl-3-(p-tolylthiomethyl)-2(3H)-benzothiazolone
N-Methoxy-N-MethylcinnaMaMide
Carbonochloridic acid, 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl ester