(5S,8R)-5-methyl-7,8,14,15-tetrahydro-5H-16-oxa-4b,8a,14-triaza-5,8-methanodibenzo[b,h]cycloocta[jkl]cyclopenta[e]-as-indacene-6,13-dione

(5S,6S,8R)-6-hydroxy-5-methyl-5,6,7,8,14,15-hexahydro-13H-16-oxa-4b,8a,14-triaza-5,8-methanodibenzo[b,h]cycloocta[jkl]cyclopenta[e]-as-indacen-13-one

13-((2R,4S,5S)-4-hydroxy-5-(iodomethyl)tetrahydrofuran-2-yl)-6,7,12,13-tetrahydro-5H-indolo[2,3-a]pyrrolo[3,4-c]carbazol-5-one

13-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-6,7,12,13-tetrahydro-5H-indolo[2,3-a]pyrrolo[3,4-c]carbazol-5-one

(3S,5R)-2-methylene-5-(7-oxo-6,7-dihydro-5H-indolo[2,3-a]pyrrolo[3,4-c]carbazol-12(13H)-yl)tetrahydrofuran-3-yl acetate