18771-50-1 2(1H)-Pyrimidinone, tetrahydro-4-hydroxy-1-beta-D-ribofuranosyl- 3,4,5,6-Tetrahydrouridine 5,6-Dihydrouridine BRN 0752319 NSC 112907 NSC-112907 NSC-112907-D TETRAHYDROURIDINE U 23284