[The estradiol and estrone esters of [103Ru]ruthenocenecarboxylic acid. Synthesis, excretion and organ distribution (author's transl)].

The synthesis of the estradiol-17beta and estrone esters of ferrocenecarboxylic acid is described. The exchange reaction of these compounds with [103Ru]RuCl3 produced the corresponging [103Ru]ruthenocene compounds. The excretion and organ distribution of these estrogen esters in mice were quite different from those of [103Ru]ruthenocenecarboxylic acid and its methyl ester. The 103Ru-labelled estrogen esters are compared to 125I or 135I-labelled derivatives with respect to possible applications.