1,4-Bis(3,4-dimethoxyphentl)-2,3-dimethylbutane 5701-82-6 Benzene, 1,1'-(2,3-dimethyl-1,4-butanediyl)bis[3,4-dimethoxy] Butane, 1,4-bis(3,4-dimethoxyphenyl)-2,3-dimethyl- Dimethyldihydroguaiaretic acid NSC136955 tetra-O-methyl nordihydroguaiaretic acid