申请人:Agence Nationale de Valorisation de la Recherche (ANVAR)
公开号:US04138489A1
公开(公告)日:1979-02-06
Pentacyclic derivatives of the general formula ##STR1## wherein R, R.sub.1, R.sub.2 and R.sub.3 are defined hereinbelow are useful as cerebral protectors and vasodilators.