13-(tert-butyl) 1-methyl (4R,4aS,7S,13bR,14aS)-7-(((tert-butoxycarbonyl)oxy)methyl)-2-hydroxy-4-methyl-5-oxo-3,4a,5,7,8,13b,14,14a-octahydroindolo[2',3':3,4]pyrido[1,2-b]isoquinoline-1,13(4H)-dicarboxylate

4a-benzyl 13-(tert-butyl) 1-methyl (4aS,7S,13bR,14aS)-7-(((tert-butoxycarbonyl)oxy)methyl)-2-hydroxy-5-oxo-3,7,8,13b,14,14a-hexahydroindolo[2',3':3,4]pyrido[1,2-b]isoquinoline-1,4a,13(4H,5H)-tricarboxylate

4a-benzyl 1-methyl (4aS,7S,13bR,14aS)-2-hydroxy-7-(hydroxymethyl)-5-oxo-3,4,7,8,13,13b,14,14a-octahydroindolo[2',3':3,4]pyrido[1,2-b]isoquinoline-1,4a(5H)-dicarboxylate

(6S,12bR)-3-(benzyloxycarbonyl)-6-(hydroxymethyl)-4-oxo-1,4,6,7,12,12bhexahydroindolo[2,3-a]quinolizine

4a-benzyl 1-methyl (4aR,7S,13bR,14aR)-2-hydroxy-7-(hydroxymethyl)-5-oxo-3,4,7,8,13,13b,14,14a-octahydroindolo[2',3':3,4]pyrido[1,2-b]isoquinoline-1,4a(5H)-dicarboxylate