6,7-dihydroxy-5-methyl-3-methylthio-6,7,8-trihydropyrazino<2,3-e>-as-triazine

(2R,2'R,4R,4'R)-N,N'-ethylene(4,4'-diphenyl)-2,2'-bisoxazolidine

5,6-Dihydro-[1,3]dioxolo[4,5-g]isoquino[3,2-a]isoquinolin-7-ylium