Antibiotic U-1 D-erythro-Hex-2-enopyranuronic acid, 4-(3-amino-5-(1-hydroxy-N-methylamidino)valeramido)-1-(4-amino-2-oxo-1(2H)-pyrimidinyl)-1,2,3,4-tetradeoxy- Desaminohydroxyblasticidin-S MP8931000 U-1