Methoxycinnamate, salicylate, etc are not elements but organic compounds that can be very complicated. I have found two web sites that show the chemical formula of some of the sun screen products but I am not sure that you will understand it. If you are doing this for a chemistry project maybe your teacher can help you. Also, please do not forget to give proper credit to the authors.
Here are the two web sites:
Sunscreen Analysis Using Molecular Modeling
Organic Structures, Sunscreens
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