Best pings on FR, BTW.
Just Google Mexoryl. It's easier to find where to buy it than find its chemical and structural formula. See comment# 18. Thanks for the complement. I get a lot of grief from troglodites by posting articles from the Times. They see conspiratorial politics behind articles where I see none, just science or medicine.
I'm a Retin-A and sunscreen woman, I get my Retin-A over the San Diego border in Tiajuana. Real cheap there.