according to the invention , the oxysulfonic derivative of the copolymer of acrolein and acrylic acid is of the following formula : ## str1 ## where n = 190 to 600 , m = 190 to 500 , and p = 830 to 850 . this biologically active compound can be used as a direct and prolonged action blood antiacoagulant to be administered in the form of 1 - or 2 - percent solutions . the preparation according to the invention features a long shelf and has a longer action than the well - known heparin .