sodium salt of the polymer of: sodium 2-methyl-buta-1,3-diene-1-sulfonate with acrylic acid and 2-hydroxyethyl-2-methylacrylate
sodium salt of the polymer of: sodium 2-methyl-buta-1,3-diene-1-sulfonate with acrylic acid and 2-hydroxyethyl-2-methylacrylate