Similar names: 1,2-Benzenediol, 4,4'-(2,3-dimethyl-1,4-butanediyl)bis-; Pyrocatechol, 4,4'-(2,3-dimethyltetramethylene)di- (8CI); 1,4-Bis(3,4-dihydroxyphenyl)-2,3-dimethylbutane; 4,4'-(2,3-Dimethyl-1,4-butanediyl)bis(pyrocatechol); 4,4'-(2,3-Dimethyl-1,4-butanediyl)bis[1,2-benzenediol]; 4,4'-(2,3-Dimethyltetramethylene)dipyrocatechol; 4-[4-(3,4-Dihydroxyphenyl)-2,3-dimethylbutyl]benzene-1,2-diol; Butane, 1,4-bis(3,4-dihydroxyphenyl)-2,3-dimethyl-; Dihydronorguaiaretic acid; Dinorguaiaretic acid, dihydro-; NDGA; NSC 4291; Nordihydroguaiaretic acid; Norguaiaretic acid, dihydro-; β,γ-Dimethyl-α,δ-bis(3,4-dihydroxyphenyl)butane