A lot of them these days are things like Uvinul A Plus (Diethylamino Hydroxybenzoyl Hexyl Benzoate) and Tinosorb S/P. They essentially act as UV filters similar to physical barriers. Many aren't available in the US, I believe due to FDA regulation of sunscreen but not totally sure why.

I stand fully corrected, and thanks for googlable names - that sounds interesting to look up and to update my memories.