2-Pentenedioicacid, 2-hydroxy-4-(oxoethylidene)- (9CI); 2-Pentenedioic acid,4-(formylmethylene)-2-hydroxy- (8CI); Glutaconic acid,4-(formylmethylene)-2-hydroxy- (7CI);4-Carboxy-2-hydroxymuconate-6-semialdehyde; 4-Carboxy-2-hydroxymuconicsemialdehyde; a-Hydroxy-g-carboxymuconic e-semialdehyde
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