SEARCH Articles Figures Tables Biosynthesis of Retronecine Dehydro retronecine Heliotridine and (-)-Retronecine Retronecine basicity Retronecine catalytic hydrogenation Retronecine ester Retronecine functional groups Retronecine hydrochloride Retronecine structure Retronecine synthesis Retronecine trachelanthate Retronecine via Diels-Alder reaction Retronecine via azomethine ylide cycloaddition Retronecine via cycloazasulfenylation of alkenes Retronecine viridiflorate Viridifloric acid 7-retronecine ester (heliospathulin) Viridifloric acid-7-retronecine Viridifloric acid-7-retronecine ester