(1R,5R,6R,8R)-8-[2-Amino-8-(4-chlorophenylthio)-6-oxohydropurin-9-yl]-3-hydroxy-6-(hydroxymethyl)-2,4,7-trioxa-3-phosphabicyclo[3.3.0]octan-3-one AIDS-114962 AIDS114962 CPT-2,3-cGMP