Abstract:
This invention relates to a sulfated polysaccharide D-HG, prepared by depolymerizing FGAG (an extract from the parietes of a sea cucumber comprising a sulfated polysaccharide having a heparinlike action) or its salt and having the following physicochemical properties, pharmaceutically acceptable salts thereof, a method for preparing the same, and drugs for treating diffuse intravascular coagulation (DIC) and thrombosis containing the same as the active ingredient: (1) molecular weight: 3000 to 42000 according to HP GPC; (2) form: white, amorphous and highly hygroscopic powder; (3) solubility: soluble in water and insoluble in organic solvents such as ethanol and acetone; (4) specific rotation: (a); (5) color reaction: Elson-Morgan reaction (+); carbozole-sulfuric acid reaction (+); cysteine-sulfuric acid reaction (+); orcinol-hydrochloric acid reaction (+); azure A metachromasia reaction (+); (6) compositional analysis: galactosamine : glucuronic acid : fucose : sulfate radical = 1 : 0.8 ± 0.2 : 0.85 ± 0.15 : 3.4 ± 0.9.
Abstract:
Sulfonic ester derivatives represented by general formula (I), wherein R1 represents hydrogen, C1-4 alkyl or C$(,3)$-4 alkoxy, A represents (II), (wherein R2 and R3 each represent C1-4 alkyl) or (III), (wherein R4 and R5 each represent C1-4 alkyl, or they may be connected to each other to form C4-6 cycloalkyl together with the adjacent carbon atom), and $(,3)$ represents an integer of 1 to 3, and a process for their preparation.