3,6-Dichlorosalicylic acid (3,6-DCSA) is an organic compound with the formula . This isomer of dichlorosalicylic acid is of interest because it is the product of the enzymatic degradation of the controversial herbicide dicamba.

3,6-DCSA is the substrate for 3,6-DCSA decarboxylase, which converts it to 2,5-dichlorophenol.

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