[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-2-[[[[(3R)-3-[2-[2-[12-(4-azido-2 -nitro-phenoxy)dodecanoylsulfanyl]ethylcarbamoyl]ethylcarbamoyl]-3-hyd roxy-2,2-dimethyl-propoxy]-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]o xymethyl]-4-hydroxy-oxolan-3-yl]oxyphospho