Terephthalylidene Dicamphor Sulfonic Acid (ya phir ecamsule aur Mexoryl SX ke naam se jaana jaata hai) ek water-soluble organic UVA filter hai jo sunscreen mein use hota hai. Ye UVA rays se broad protection deta hai aur photostable hota hai, matlab sun ke aage bhi kharab nahi hota. Usually isko aur filters ke saath combine kiya jaata hai zyada badhiya protection ke liye.