1 9L9 (2s)-2-[[4-[[2,4-bis(azanyl)-6-oxidanylidene-1h-pyrimidin-5-yl]carbamoylamino]phenyl]carbonylamino]pentanedioic acid 1.000 2 J49 (2s)-2-[[4-[(4-azanyl-6-oxidanyl-pyrimidin-5-yl)carbamoylamino]phenyl]carbonylamino]pentanedioic acid 0.968 3 KUK (2~{S})-2-[[5-[[2,4-bis(azanyl)-6-oxidanylidene-5~{H}-pyrimidin-5-yl]carbamoylamino]pyridin-2-yl]carbonylamino]-4-(1~{H}-1,2,3,4-tetrazol-5-yl)butanoic acid 0.730