76722-02-6 Sulfurous acid, monosodium salt, reaction products with 2-butene-1,4-diol and propylene oxide, polymers with 1,6-diisocyanatohexane, formaldehyde,1,6-hexanediol, 5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane, phthalic anhydride and urea