1,3-Dioxo-1H,3H-naphtho(1,8-cd)pyran-6,7-dicarboxylate 1,3-Dioxo-1H,3H-naphtho(1,8-cd)pyran-6,7-dicarboxylic acid monosodium salt, monohydrate 1,4,5,8-Naphthalene tetracarboxylic acid 4,5-anhydride 1,4,5,8-Naphthalene tetracarboxylic acid 4,5-anhydride, monosodium salt, monohydrate 1,4,5,8-Ntcaa 141193-56-8 1H,3H-Naphtho(1,8-cd)pyran-6,7-dicarboxylic acid, 1,3-dioxo-, monosodium salt, monohydrate