6-N-bis(t-butoxycarbonyl)-8-(N-[t-butoxycarbonyl]-DL-2''-butylglycin-6''-yl)-2',3'-O-isopropylidene-5'-O-sulfamoyladenosine

cyclo8C3β-6-N-bis(t-butoxycarbonyl)-5'-O-(N-[N-t-butoxycarbonyl-L-alanyl]sulfamoyl)adenosine