these results give further evidence that a ) nicorandil exerts its vasodilating effect via stimulation of guanylate cyclase and b ) nitrate esters , such as nitroglycerin or nicorandil , stimulate the enzyme , at least in vitro , only in the presence of cysteine or , to a lesser extent , thiosalicylic acid .
C0028125
nitrate
C0017887
nitroglycerin