1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetraacetic Acid
http://www.cosmoscience.org/shop/fm-3b-t1875-14710-tetraazacyclododecane-14710-tetraacetic-acid-39709
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1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetraacetic Acid 1g : DOTA ligand for MRI contrast agents, radiopharmaceuticals, and metal chelation.
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