1-[(2-Hydroxyethoxy)methyl]-6-phenylthio-4-thiothymine 4(1H)-Pyrimidinone, 2,3-dihydro-1-[(2-hydroxyethoxy)methyl]-5-methyl-6-(phenylthio)-4-thioxo- AIDS-002626 AIDS002626 HEPT derivative HEPT-4S