Octisalate-d4 (Octyl salicylate-d4, 2-Ethylhexyl salicylate-d4) is the deuterium labeled Octisalate (HY-B0929). Octisalate (Octyl salicylate) is an organic compound with high lipophilicity, which is used in sunscreens and cosmetics that absorbs UVB rays[1][2][3].