• 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