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![1,8-Dioxo-1,3,4,8-tetrahydro-2H-pyrido[1,2-a]pyrazine-6-carboxylic acid](https://api.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/145/379/71ba7cd3-d5cf-4da1-a223-43f38d8dbdc0/640/71ba7cd3-d5cf-4da1-a223-43f38d8dbdc0.png)