1H,3H-Naphtho(1,8-cd)pyran-1,3-dione, 6-chloro- 4-Chloronaphthalene-1,8-dicarboxylic anhydride 4-Chloronaphthalic anhydride 4053-08-1 6-Chloro-1H,3H-naphtho(1,8-cd)pyran-1,3-dione EINECS 223-760-7 Naphthalic anhydride, 4-chloro- (7CI,8CI)