53665-78-4 3-[(2s,5s,8s,11s)-8-(4-aminobutyl)-5,11-dimethyl-3,6,9,12-tetraoxo-1,4,7,10-tetrazacyclododec-2-yl]propanoic Acid;hydrochloride 98818-74-7 tert-butyl [(2S,5S,8R,10S,11S,14S,17S)-8,11,14-tribenzyl-2-carbamoyl-10-hydroxy-5-(2-methylpropyl)-4,7,13,16-tetraoxo-1,18-diphenyl-3,6,12,15-tetraazaoctadecan-17-yl]carbamate (non-preferred name)