(2)Benzopyrano(6,5,4-def)(2)benzopyran-1,3,6,8-tetrone 1,4,5,8-NAPHTHALENETETRACARBOXYLIC ACID, 1,8:4,5-DIANHYDRIDE 1,4,5,8-Naphthalenetetracarboxylic 1,8:4,5-dianhydride (8CI) 1,4,5,8-Naphthalenetetracarboxylic acid anhydride 1,4,5,8-Naphthalenetetracarboxylic acid dianhydride 1,4,5,8-Naphthalenetetracarboxylic dianhydride 1,8:4,5-Naphthalenetetracarboxylic dianhydride 2,7-Dioxapyrene-1,3,6,8-tetrone 4052-78-2 5-19-05-00423 (Beilstein Handbook Reference) 81-30-1 BRN 0272788 EINECS 201-342-5 NSC 84241 NTCDA Naphthalene-1,8:4,5-tetracarboxylic dianhydride Naphthalenetetracarboxylic dianhydride