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Isobutyl oleate is an ester, and esters generally have lower melting points compared to their corresponding carboxylic acids. However, predicting the exact melting point without experimental data is challenging. The presence of a long hydrocarbon chain in isobutyl oleate suggests a lower melting point than -20 degrees C, as the molecule would have weaker intermolecular forces. However, without additional information, I can't confirm if it's lower than -20 degrees C.