.beta.-D-Pseudouridine .beta.-Pseudouridine .psi.-Uridine 1445-07-4 2,4(1H,3H)-Pyrimidinedione, 5-.beta.-D-ribofuranosyl- 5-Ribosyluracil NSC162405 Pseudouridine Pseudouridine C Uracil, 5-.beta.-D-ribofuranosyl-