2-hydroxy-5-carboxymethyl-cis,cis-muconate 6-semialdehyde 2-hydroxy-5-carboxymethylmuconate 6-semialdehyde 2-hydroxy-5-carboxymethylmuconate semialdehyde 5-carboxymethyl-2-hydroxymuconate 6-semialdehyde 5-carboxymethyl-2-hydroxymuconate semialdehyde CPD-783