F 1557 (OTTO) Fumaric acid, GR 99%+ Cas 110-17-8 - used in the manufacture of polyester resins and polyhydric alcohols and as a mordant for dyes. F 1557 (OTTO) Fumaric acid, GR 99%+ Cas 110-17-8 - used in rosin esters, drying oils, printing inks and flavoring agent.