920506-52-1

1,4,7,10-Tetraazacyclododecane-1,4,7-tricarboxylic acid,10-[2-[[(2S)-2-amino-3-(1H-indol-3-yl)-1-oxopropyl]amino]ethyl]-,1,4,7-tris(1,1-dimethylethyl) ester