(2E,4Z)-2-amino-6-oxohexa-2,4-dienoic acid (2E,4Z)-2-amino-6-oxo-hexa-2,4-dienoic acid (2E,4Z)-2-amino-6-keto-hexa-2,4-dienoic acid 2-aminomuconic 6-semialdehyde CHEBI:15745 C03824 2-Aminomuconate 6-semialdehyde 2-aminomuconate semialdehyde