Sydnone imine
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Sydnone imine is a mesoionic heterocyclic aromatic chemical compound. Sydnone imine is the imine of sydnone where the keto functional group of sydnone (=O) has been replaced with an imine (=NH) group. A sydnone imine substructure can be found in the stimulant drugs feprosidnine and mesocarb and the vasodilator molsidomine.