The results of experimental investigation carried out on rats have demonstrated the extremely high anticoagulant effect of super low quantities of newly synthesized GSH-17 preparation from coumarin line compounds. 30-60 minute effect of the last is characterized by the further shifts thromboplastick activity with the tendency to its activation. That confirms opinion on possible reception of opposite physiological activity of the same connection in full conformity to the principles which have taken roots in a science of doz-dependence of one connection, is not dependent on concentration.