137530-43-9 2(1H)-Pyrimidinone, 4-amino-5-bromo-1-(2-(hydroxymethyl)-1,3-oxathiolan-5-yl)-, (2S-cis)- 5-Bhmo-cytosine 5-Bromo-1-(2-(hydroxymethyl)-1,3-oxathiolan-5-yl)cytosine