3-Benzyl-1-(2-hydroxy-ethoxymethyl)-2,2-dioxo-6-phenyl-2,3-dihydro-1H-2.lambda.6-thieno[3,2-c][1,2,6]thiadiazin-4-one 3-Benzyl-1-[(2-hydroxyethoxy)methyl]-6-phenyl-thieno[3,2-c][1,2,6]thiadiazin-4(3H)-one 2,2-dioxide AIDS-104971 AIDS104971