3'-Azido-3'-deoxy-5'-O-{5-[4,8-bis(tert-butoxycarbonyl)-11-{5-oxo-5-[4,8,11-tris(tert-butoxycarbonyl)-1,4,8,11-tetraazacyclotetradecanyl]pentanoyl}-1,4,8,11-tetraazacyclotetradecanyl]pentanoyl}thymidine AIDS-071414 AIDS071414