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Aspirin, as starting precursor, was reacted with SOCl2 to generate acyl chloride compound via esterifying eugenol to aspirin eugenol ester (AEE) with a yield of 65%. Tests of AEE for acute toxicity, anti-inflammatory, analgesic, and antipyretic effects were carried out in mice and rats. The results showed that toxicity of AEE was significantly reduced, about 50 and 3.7 times lower than aspirin and eugenol, respectively. Its strength of anti-inflammation, analgesia, and antipyresis was similar as aspirin and eugenol, but the effects lasted longer.
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