[(2S,3R)-2,6-diamino-3-hydroxy-7-methyl-5,8-dioxo-2,3-dihydro-1H-pyrrolo[1,2-a]indol-4-yl]methyl carbamate; ((1R,2S)-2,7-Diamino-1-hydroxy-6-methyl-5,8-dioxo-2,3,5,8-tetrahydro-1H-pyrrolo[1,2-a]indol-9-yl)methyl carbamate; (1R-trans)-2,7-Diamino-9-[[(aminocarbonyl)oxy]methyl]-2,3-dihydro-1-hydroxy-6-methyl-1H-Pyrrolo[1,2-a]indole-5,8-dione; 1H-Pyrrolo[1,2-a]indole-5,8-dione, 2,7-diamino-9-[[(aminocarbonyl)oxy]methyl]-2,3-dihydro-1-hydroxy-6-methyl-, (1R-trans)