5,5',5'',5'''-(1,4,8,12-Tetraazacyclopentadecane-1,4,8,12-tetrayl)tetrakis(N-benzylpentan-1-amine)benzyl(5-{1,4,12-tris[5-(benzylamino)pentyl]-1,4,8,12-tetraazacyclopentadecan-8-yl}pentyl)amine AIDS-073016 AIDS073016 Tetraazamacrocycle