Synthesis and tumor inhibiting activity of lanthanum (III) complexes with some 1-aminocycloalkancarboxylic acids.

Complexes of La(III) with 1-aminocyclopentane-, -hexane, -heptane and -4-ethylcyclohexanecarboxylic acids were obtained. The compounds were characterized by elemental analyses, IR spectroscopy and conductivity measurements. The following general formula was derived: LaL3Cl3 x 5 H2O, where L is the corresponding 1-aminocycloalkanecarboxylic acid. The pharmacological studies showed that all complexes manifested higher cytostatic and cytotoxic effects in comparison with lanthanum chloride. Much higher cytotoxic (anti-P388/D1) and cytostatic (anti-L-1210 and anti-melanoma-B16) activity was found for the lanthanum complex with 1-aminocyclopentanecarboxylic acid.