Chrysoidine R (C.I. 11320), also known as Basic Red 9, is a cationic dye with the chemical formula C20H15N3Na2O9S2 and a molecular weight of 558.4 g/mol. It is commonly used in biochemical, histological and cytological staining processes. This product is also used in the detection of proteins and nucleic acids. For more information, please refer to the Pubmed link: https://pubmed.ncbi.nlm.nih.gov/14584018/.