CAS 2931-90-0 appears in our catalog under these names: Ferulic Acid Impurity 18, 4-Hydroxy-5-methoxyisophthalaldehyde 98%, 4-Hydroxy-5-methoxyisophthalaldehyde (Standard), 4-Hydroxy-5-methoxy-1,3-benzenedicarboxaldehyde, 98%, 98%. Offered by: Chemat Brand, Ambeed, MedChemExpress, Chemat. Available pack sizes: on request, 100mg, 250mg, 1g, 5g, Get quote.