| abstract |
To provide an ultraviolet absorbent or photostabilizer having excellent absorption ability over a wide ultraviolet wavelength range and high stability and safety. Providing the ultraviolet absorbent composition, the light stabilizing composition, and the skin external preparation which mix | blended this.n n n A ultraviolet absorbent, a light stabilizer, and a UV absorbent composition, a light stabilizer composition, and an external preparation for skin, comprising a pyridazine derivative of the following general formula and / or a salt thereof as an active ingredient.n n n n n n n n [Wherein R 1 , R 2 , R 3 and R 4 are not hydrogen atoms at the same time, and R 2 and R 3 are not morpholino groups at the same time.] |