• 4, 6-Di-Tert-Butyl-M-Cresol CAS 497-39-22021-12-16
• 4,4′-diaminodiphenylmethane CAS 101-77-92021-12-16
• 4,5-Dimethyl-1,3-dioxol-2-one CAS: 37830-90-32021-12-16
• 4,4′-dihydroxy-7,7′-ureylenedi(naphthalene-2-sulphonic acid CAS:134-47-42021-12-16