CAS 5281-04-9 appears in our catalog under these names: Lithol Rubin BCA, >85.0%(E), Calcium 3-hydroxy-4-((4-methyl-2-sulfonatophenyl)diazenyl)-2-naphthoate, LITHOL RUBINE BK, Pigment red 57-1. Offered by: TCI, Chemat, Sigma-Aldrich, MedChemExpress. Available pack sizes: 25g, 1g, 5g, 100g, 500g, 25MG, Get quote.