A huge variety of types of cancer makes it necessary to search for new effective drugs with a defined molecular target. Modification of substituents in ligands based on 3-hydroxy-1,1-cyclobutanedicarboxylic acid are one of the effective directions to design a better version of carboplatin. In the present study, we combined in one molecule a derivative of 3-hydroxycyclobutane-1,1-dicarboxylic acid and N-methylpyrazole as a carrier ligand. The antiproliferative of the novel complex Pt(II) was established for cell lines HCT116, MCF7, A549, and WI38 by means of a standard MTT colorimetric assay.