1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic acid, 10-[(1R,2S)-2,3-dihydroxy-1-(hydroxymethyl)propyl]-, 1,4,7-tris(1,1-dimethylethyl) ester, rel-
1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic acid, 10-[(1R,2S)-2,3-dihydroxy-1-(hydroxymethyl)propyl]-, 1,4,7-tris(1,1-dimethylethyl) ester, rel-