Molsidomine

Overview
Molsidomine is an orally active, long acting vasodilating drug. Molsidomine is metabolized in the liver to the active metabolite SIN-1. SIN-1 is an unstable compound that releases nitric oxide upon decay as the actual vasodilating compound.

Chemistry
Molsidomine as well as SIN-1 are sydnone imines, a class of mesoionic heterocyclic aromatic chemical compounds.