4,7-Methano-1H-indene-5-carboxylic acid, octahydro-, ethyl ester 4,7-Methanoindan-5-carboxylic acid, hexahydro-, ethyl ester 68140-56-7 EINECS 268-807-2 Ethyl octahydro-4,7-methano-1H-indene-5-carboxylate