Volatile oil obtained from the angelica plant. The oil contains chemical constituents that can be phototoxic, including bergapten, imperatorin, and xanthotoxin. Although some components of angelica oil have antioxidant ability, it is a risky ingredient to use on skin if it is exposed to sunlight.
References for this information:
Journal of Agricultural and Food Chemistry, March 2007, issue 5, pages 1737-1742