Showing structure for 3-[9,14,19-tris(2-carboxyethyl)-5,10,15,20-tetramethyl-21,22,23,24-tetraazapentacyclo[16.2.1.1³,⁶.1⁸,¹¹.1¹³,¹⁶]tetracosa-1,3(24),4,6,8,10,12,14,16,18(21),19-undecaen-4-yl]propanoic acid