Providing an ultraviolet absorbent or photostabilizer with excellent absorption over a wide ultraviolet wavelength range and great stability and a high safety profile, as well as an ultraviolet-absorbing composition, a photostabilized composition and an external preparation for skin, where the pyridazine derivative of the following general formula and/or a salt thereof is included as the effective component of the ultraviolet absorbent or photostabilizer, or is included in the ultraviolet-absorbing composition, the photostabilized composition and the external preparation for skin:
Wherein R1, R2, R3 and R4 are not simultaneously hydrogen atom; and R2 and R3 are not simultaneously morpholino group.
提供一种具有在广泛紫外波长范围内优异吸收性和稳定性以及高安全性的
紫外线吸收剂或
光稳定剂,以及一种紫外线吸收组合物、光稳定组合物和外用皮肤制剂,其中以下通式的
吡啶嗪衍
生物和/或其盐作为
紫外线吸收剂或
光稳定剂的有效成分,或包含在紫外线吸收组合物、光稳定组合物和外用皮肤制剂中:其中,R1、R2、R3和R4不同时为氢原子;且R2和R3不同时为吗啉基团。