Novel spermicidal compounds which are organometallic cyclopentadienyl metal complexes, particularly vanadium IV complexes, including their corresponding therapeutic compositions are described....http://www.google.fr/patents/US6627655?utm_source=gb-gplus-shareBrevet US6627655 - Vanadium (IV) metallocene complexes having spermicidal activity
Vanadium (IV) metallocene complexes having spermicidal activity