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Synthesis 5g maleic anhydride, 12g dehydrated alcohol, 0.3g acid zeolite, 15ml benzene are added to the reaction vessel, install water trap, reflux condensing tube, and thermometer on the reaction vessel, reflux water-dividing is carried out in heating, reaction reacts 30min again after occurring without the globule, stops heating, after normal temperature cooling 30min, release water layer, reaction solution washes with water, distill after drying, first steam front-end volatiles, the cut regathering 216 ~ 220°C is product Diethyl maleate
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Count:75 Tablets
It was double-blinded, randomized, and placebo-controlled [9]