thumb|right|General structural formula of a sulfonylurea. The functional group consists of a sulfonyl group and a N-substituted ureylene group
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thumb|right|General structural formula of a sulfonylurea. The functional group consists of a sulfonyl group and a N-substituted ureylene group
Sulfonylureas or sulphonylureas are a class of organic compounds used in medicine and agriculture. The functional group consists of a sulfonyl group (-S(=O)2) with its sulphur atom bonded to a nitrogen atom of a ureylene group (N,N-dehydrourea, a dehydrogenated derivative of urea). The side chains R1 and R2 distinguish various sulfonylureas. Sulfonylureas are the most widely used herbicide.
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