A new water-soluble and more water-stable analogue of lobaplatin, cis-[Pt(Ⅱ)(trans-1,2-bis(methylamino)cyclobutane)(3-hydroxyl-1,1-cyclobutanedicarboxylate)], was designed, with an attempt to improve the water-stability of lobaplatin while retaining its excellent anticancer profile, via the structural recombination and optimization of lobaplatin and carboplatin. The analogue was synthesized by the direct reaction between cis-[Pt (Ⅱ)(trans-1,2-bis(methylamino))I2] as an intermediate and the silver salt of 3-...