3-Carboxy-2H-naphtho(2,1-b)pyran-2-one, ethyl ester 3-Oxo-3H-naphtho(2,1-b)pyran-2-carboxylic acid ethyl ester 3H-Naphtho(2,1-b)pyran-2-carboxylic acid, 3-oxo-, ethyl ester 5,6-Benzocoumarin-3-carboxylic acid ethyl ester 5,6-Benzocumarin-3-carbonic acid ethyl ether 5-18-08-00444 (Beilstein Handbook Reference) 734-88-3 BRN 0234987 Belophar KLA Compound 13-61 EINECS 211-997-9 Ethyl 5,6-benzocoumarin-3-carboxylate Optical bleach 13-61