(1-{(2S,3R,4R,5S)-1-[2-((2S,4S,5R,6S)-5-Acetylamino-4-hydroxy-2-hydroxymethyl-6-methoxy-tetrahydro-pyran-3-ylamino)-ethyl]-3,4-dihydroxy-5-hydroxymethyl-pyrrolidin-2-yl}-1,1-difluoro-methyl)-phosphonic acid diethyl ester AIDS-121946 AIDS121946