1,2,3,4,4a,5,6,11,11b,12,13,13a-Dodecahydro-4b,11-diaza-indeno[2,1-a]phenanthren-1-ol

1-Hydroxy-1,2,3,4,4a,5,6,11,11b,12,13,13a-dodecahydro-4b,11-diaza-indeno[2,1-a]phenanthrene-2-carboxylic acid methyl ester

11-(tert-butoxycarbonyl)-2,3,4,5,6,11b,12,13-octahydro-1-oxo-11H-4b,11-diazaindeno[2,1-a]phenanthrene

1-Oxo-2,3,4,5,6,11b,12,13-octahydro-1H-4b,11-diaza-indeno[2,1-a]phenanthrene-2,11-dicarboxylic acid 11-tert-butyl ester 2-methyl ester

1-Oxo-2,3,4,5,6,11b-hexahydro-1H-4b,11-diaza-indeno[2,1-a]phenanthrene-11-carboxylic acid tert-butyl ester