2(1H)-Pyrimidinone, 1-(2-deoxy-5-O-(hydroxy((hydroxy(phosphonooxy)phosphinyl)oxy)phosphinyl)-beta-D-erythro-pentofuranosyl)-4-ethoxy-5-methyl- 4-ET-Ttp 96027-03-1 O(4)-Ethylthymidine 5'-triphosphate