Copper(<scp>ii</scp>) quinolinonato-7-carboxamido complexes as potent antitumor agents with broad spectra and selective effects

[Cu(qui^x)(phen)]NO₃·<italic>y</italic>H₂O (qui^x = 2-(4-amino-3,5-dichlorophenyl)-3-hydroxy-4(1<italic>H</italic>)-quinolinone-7-carboxamides) showed potent cytotoxicity against human cancer cells, lower toxicity on non-malignant cells, and ability to interact with biomolecules.