The syntheses of isomers of the antitumor agent cis, trans, cis-[PtCl2 (OAc) 2NH3 (c- C6H11NH2)](JM-216) and other complexes [PtCl m (OAc)(4-m) NH3 (c-C6H11NH2)](m= 0- 4) are described. Both oxidative addition to platinum (II) complexes and substitution of platinum (IV) complexes have been used in the syntheses. The stereochemistry of the complexes has been determined by spectroscopic studies, primarily 13C and 15N NMR ...