2-amino-5-[(1S,2R,3S)-N-(o-nitrobenzenesulfonyl)-2,3-isopropylidinedioxycyclopent-4-enylaminomethyl]-pyrrolo[2,3-d]pyrimidin-4(3H)-one

2-amino-5({[(3a′R,4′S,6a′S)-2,2-dimethyl-4,6a′-dihydro-3a′H-cyclopenta[d][1,3]dioxol-4-yl]amino}methyl)-3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-one