Terephthalidene Dicamphor Sulfonic Acid (ecamsule, ya Mexoryl SX ke naam se bhi jaana jaata hai) ek photostable organic UVA filter hai jo sunscreens mein use hota hai — skin ko UVA rays se hone wale damage se bachata hai. Yeh water-soluble hota hai aur aksar doosre filters ke saath combine karke use kiya jaata hai taaki broad-spectrum protection mile.