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Isobutyl oleate, a fatty ester, is more soluble in diethyl ether and petroleum ether than in water. This is because it is a nonpolar molecule, and like dissolves like. Diethyl ether and petroleum ether are nonpolar solvents, while water is polar. Nonpolar molecules are more attracted to other nonpolar molecules, leading to greater solubility in nonpolar solvents.