1,3-Benzofurandione-5-carbonyl chloride 1204-28-0 4-(Chlorocarbonyl)phthalic anhydride 4-(Chloroformyl)phthalic anhydride 5-Isobenzofurancarbonyl chloride, 1,3-dihydro-1,3-dioxo- Anhydrotrimellitic acid chloride NSC89728 Phthalic anhydride, 4-(chloroformyl)- Trimellitic acid anhydride 4-monoacid chloride Trimellitic acid anhydride chloride Trimellitic anhydride acid chloride Trimellitic anhydride chloride Trimellitic anhydride monoacid chloride Trimellitic anhydride monochloride