ˈɔːl fˈiːtʃɚɹ ɐ kɹˈoʊmeɪn ɹˈɪŋ, wɪð ɐ haɪdɹˈɑːksɪl ɡɹˈuːp ðæt kæn doʊnˈeɪt ɐ hˈaɪdɹədʒən ˈæɾəm tə ɹᵻdˈuːs fɹˈiː ɹˈædɪkəlz ænd ɐ hˌaɪdɹəfˈoʊbɪk sˈaɪd tʃˈeɪn wˌɪtʃ ɐlˈaʊz fɔːɹ pˌɛnɪtɹˈeɪʃən ˌɪntʊ bˌaɪəlˈɑːdʒɪkəl mˈɛmbɹeɪnz.
All feature a chromane ring, with a hydroxyl group that can donate a hydrogen atom to reduce free radicals and a hydrophobic side chain which allows for penetration into biological membranes.