Benzylidene chordate derivatives, ultraviolet absorbers and skin external preparations comprising them

摘要

The present invention relates to a benzylidene hydride derivative represented by the following general formula (1), an ultraviolet absorber and an external preparation for skin containing the same,;(Provided that R^OneIs a linear or branched alkyl group having 1 to 8 carbon atoms, R²Represents a branched alkyl group having 5 to 18 carbon atoms.);It is characterized by excellent UV-A absorption ability, solubility and no coloring reaction by metal ions.