From Ushinsunine

Liriodenine can also be prepared by oxidation of the aporphine unshinsunine (Id) 14 16) or roemerine (le) with chromium trioxide in pyridine 14). Other oxidizing agents which afford hriodenine from ushinsunine are acidic potassium permanganate, selenium dioxide, and selenium 15). A superior method involves the air oxidation of a potassium tertiary butoxide in i-butyl alcohol solution of anonaine (If) 17). 

Three other new 7-hydroxylated aporphines have also been isolated from the tuberous roots of S. venosa they are all identified to be the /V-oxides of identical configuration, namely, (-)-sukhodianine /3-N-oxide (46), (-)-ushinsunine /3-,/V-oxide (47), and (-)-stephadiolamine f3-N-oxide (48). The cis relationship between H-6a and H-7 is indicated from the NMR spectrum, and a partial NMR NOE study clarified the configuration of the N-oxide function (30). 

The other known alkaloids that have been isolated from S. venosa include (-)-crebanine, dehydrocrebanine, oxocrebanine, oxostepha-nine, liriodenine, (-)-anonaine, (-)-asimilobine, (-)-nuciferoline, (-)-apoglaziovine, (-)-tuduranine, (-)-mecambroline, (-)-stesakine, (-)-ushinsunine, and (-)-4a-hydroxycrebanine. The two major alkaloids found are the known norproaporphine, ( + )-stepharine, and the aporphine (-)-crebanine (28-32). 

---