Homosalate

Homosalate is an oil-soluble sunscreen active ingredients approved internationally. It must still be mixed with other sunscreens to provide adequate protection.

What are the benefits?

Homosalate is not an ideal UV filter on its own, due to its low-level protection and is not photostable (loses 10% of its SPF protection in 45 minutes), so it must still be mixed with other sunscreens to provide adequate protection. Its key advantage is that it is a liquid and is excellent for dissolving other difficult-to-solubilize powder sunscreen agents.

See also:
UVA
UVB

Ref:
Couteau, C., et al. "Study of the efficacy of 18 sun filters authorized in European Union tested in vitro." Die Pharmazie-An International Journal of Pharmaceutical Sciences 62.6 (2007): 449-452.
Couteau, Céline, et al. "Study of the photostability of 18 sunscreens in creams by measuring the SPF in vitro." Journal of pharmaceutical and biomedical analysis 44.1 (2007): 270-273.