1887-02-1 18905-34-5 2,3,5,6-Tetrahydroxy-1,4-benzoquinone, disodium salt 2,5-Cyclohexadiene-1,4-dione, 2,3,5,6-tetrahydroxy-, disodium salt EINECS 217-557-2 M 122 NCI 974 NSC 33520 Tetrahydroxyquinone disodium derivative Tetrahydroxyquinone, disodium salt Tetroquinone disodium derivative p-Benzoquinone, 2,3,5,6-tetrahydroxy-, disodium salt p-Benzoquinone, 2,3,5,6-tetrahydroxy-, disodium salt (8CI) p-Benzoquinone, tetrahydroxy-, disodium deriv.