2-[(2E)-2-(2,6-Dicarboxy-2,3-dihydro-1H-pyridin-4-ylidene)ethylidene]azaniumyl-4-hydroxy-4-oxobutanoate
2-[(2e)-2-(2,6-dicarboxy-2,3-dihydro-1h-pyridin-4-ylidene)ethylidene]azaniumyl-4-hydroxy-4-oxobutanoate