127311-85-7 4,7-Epoxy-1H-indene-3a,7a-dicarboxylic acid, hexahydro-, (3a-alpha,4-alpha,7-alpha,7a-alpha)- Hexahydro-4,7-epoxy-1H-indene-3a,7a-dicarboxylic acid, (3a-alpha,4-alpha,7-alpha,7a-alpha)-