Chemical formula: C28H30O4 Relative molecular weight: 440.54.

Commonly used as acid-base indicator, pH9.3 (colorless) ~ 10.5 (blue); Chromatographic analysis reagent, blood test reagent

If the solid is left for a long time, it will be oxidized, and the solution will be oxidized faster, but it is insensitive to light and only needs to be sealed and stored in the dark.