The known alkaloids (-)-stylopine, (-)-canadine, (+/-)-sinactine, (+)-nantenine, (+)-bulbocapnine, protopine, (-)-isocorydine, (-)-domesticine, alpha-allocryptopine and berberine were found in a mixture of alkaloids from Corydalis slivenensis (Papaveraceae), growing in Bulgaria. Dehydronantenine, corydine, predicentrine and isoboldine were detected by means of a thin-layer chromatography. Two other alkaloids - (+)-tetrahydrocorysamine and (-)-cavidine, were identified on the basis of their spectral data.

A new 4,5-dioxoaporphine, named corydione, was isolated from the whole herb of Corydalis bulbosa (L.) Dc (Papaveraceae), together with dehydronantenine, (-)-stylopine, (+)-bicuculline, (-)-adlumidine, (+)-nantenine, (+)-bulbocapnine, protopine (-)-domesticine, (+)-corydine, predicentrine, oxonantenine, (+)-isoboldine and nandazurine. Glaucine and thaliporphine were detected by means of thin-layer chromatography. In addition, one minor alkaloid Cb-4, uncompletely identified, was described. The spectral data of corydione, predicentrine and nandazurine are given.

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As a result of the reinvestigation of the alkaloid content of CORYDALIS BULBOSA (L.) DC. (Papaveraceae), growing in Bulgaria, a new 8,11-dioxoaporphine alkaloid, named bulbodione, together with dihydrosanguinarine, dehydroglaucine, (+/-)-sinactine, glaucinone and bicucullinine were isolated. These six alkaloids had not been detected in our initial study of the plant. The structure of buldodione was elucidated on the basis of spectral data and confirmed by synthesis of the alkaloid by means of Fremy's radical oxidation of bulbocapnine. The identification of the known alkaloids was obtained from their IR and (1)H-NMR spectral data and by direct comparison with authentic samples.

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