Where's the better Pirenoxine

Where's the better Pirenoxine? Many people are strange to this object, and xiamen is the introduction to it:

Pirenoxine, an alias of white acid, is a chemical. Chemical name 1 - hydroxy-5-oxygen-5h - pyridine and - [3, 2-a] - phenoxazine - 3 - carboxylic acid, molecular formula C16H8N2O5, molecular weight 308.24500. Ipranoxocine is a powder of the pupil, which is mainly used for senile cataract, cataract, trauma, congenital cataract and retinitis pigmentosa.