WNU wnu 2-(~2~H_2_)amino-8-[(4-chlorophenyl)sulfanyl]-9-[(2S,4aR,6R,7R,7aS)-2-hydroxy-7-(~2~H)hydroxy-2-oxotetrahydro-2H,4H-2lambda~5~-furo[3,2-d][1,3,2]dioxaphosphinin-6-yl](~2~H)-1,9-dihydro-6H-purin-6-one WNU