SarmentosinSarmentosin is a glycoside and that is found in several plant species, notably Ribes nigrum and Sedum sarmentosum.Chemical structureSarmentosin has a molecular formula of C11H17NO7 and a molecular weight of 275.25 g/mol. Its IUPAC name is -2--4-oxybut-2-enenitrile.EcologyAt least two Parnassius butterflies, Parnassius apollo and Parnassius smintheus, sequester sarmentosin and other hydroxynitrile glucosides in their bodies from the Sedum plants they eat.