There are provided novel fluorescent agents, such as pyrazoline compounds represented by formula (I):
(wherein R1, R2 and R3 are as defined in the specification),
having an ethynyl group in the molecule,
which have high absorptivity in the ultraviolet-visible short wavelength range (for example, 350 nm-420 nm).
提供了新颖的荧光剂,例如由式(I)表示的
吡唑啉化合物:(其中R1,R2和R3如说明书中所定义),分子中具有
乙炔基,在紫外-可见短波长范围(例如350nm-420nm)具有高吸收性。