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Sodium hydroxide (29.1 ml, 58.2 mmol) was added to a solution of 1-methylethyl 5-chloro-6-[(1-methylethyl)oxy]-3-pyridinecarboxylate (D30) (3 g, 11.64 mmol) in methanol (25 ml) and stirred at room temperature overnight. The solvent was evaporated before neutralising with 2M HCl and extracting with ether. It was then dried over magnesium sulfate and evaporated to give an impure white solid. Trituration with DCM gave the title compound as a pure white solid. MS (ES) C9H10ClNO3 requires 215, found 216 [M+H]+

1. customThe solvent was evaporated
2. extractionextracting with ether
3. dry with materialIt was then dried over magnesium sulfate
4. customevaporated
5. customto give an impure white solid