3-Nitro-5-(pyridin-4-yl)pyridin-2-ol
3-Nitro-5-(pyridin-3-yl)pyridin-2-ol
4-Methyl-5-(pyridin-4-yl)pyridin-2-ol
3-Methyl-5-(pyridin-4-yl)pyridin-2-ol
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