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Pyridine is generally not a suitable solvent for extraction of isobutyl oleate. It's a strong base and could react with the ester, leading to unwanted side reactions. Dichloromethane (DCM) is a good choice because it is a non-polar solvent that effectively dissolves isobutyl oleate while being immiscible with water. Additionally, DCM is generally more volatile than pyridine, making it easier to remove from the extract.