1,8-Naphthalenedicarboxylic acid anhydride 1,8-Naphthalenedicarboxylic anhydride 1,8-Naphthalic acid anhydride 1,8-Naphthalic anhydride 1H,3H-Naphtho[1,8-cd]pyran-1,3-dione 81-84-5 NSC5747 Naphthalene-1,8-dicarboxylic acid anhydride Naphthalic acid anhydride Naphthalic anhydride Protect WLN: T666 1A M CVOVJ