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ethyl 4-methoxycinnamate; CAS No.: 24393-56-4; As a worldwide chemical supplier, ChemShuttle offers methoxycinnamate esters for cosmetic UV filter synthesis. The ethyl ester and 4-methoxy group enhance photostability. Our Heck coupling achieves trans-selectivity. This product enables formulation of broad-spectrum sunscreens with improved safety profiles.