1-(.beta.-D-Ribofuranosyl)-4-amino-2-pyridone 2(1H)-Pyridinone, 4-amino-1-.beta.-D-ribofuranosyl- 2(1H)-Pyridone, 4-amino-1-.beta.-D-ribofuranosyl- 28307-19-9 3-Deazacytidine NSC133115