3-[10,14,19-tris(2-carboxyethyl)-5,9,15,20-tetrakis(carboxymethyl)-5,20-dimethyl-21,22,23,24-tetraazapentacyclo[16.2.1.1³,⁶.1⁸,¹¹.1¹³,¹⁶]tetracosa-1,3(24),6,8,10,12,14,16(22),17-nonaen-4-yl]propanoic Acid - Ontify