Synonyms: 1,3-Isobenzofurandione, castor oil polymer;1,3-Isobenzofurandione,castor oil polymer;Castor oil, polyester with phthalic anhydride;Castor oil, polymer with phthalic anhydride;Castor oil,polyester with phthalic anhydride;Castor oil,polymer with phthalic anhydride