This is the chemical symbol for copper in its +1 oxidation state. In the context of the article, it likely refers to copper complexes formed with the new tris(7-naphthyridyl)methane derivatives.
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7-CHLORO-2,4-DIMETHYL-[1,8]NAPHTHYRIDINE
(S,E)-benzyl 2-(5-(tert-butoxycarbonylamino)tetrahydro-2H-pyran-2-ylidene)acetate
