- 二甲基砷酸 èrjiǎjīshēnsuān cacodylic aciddimethylarsenic acid (CH3)2AsO2H, an organic arsenic compound used in chemistry and historically as a herbicide
- 二甲基胂酸 èrjiǎjīshènsuān cacodylic aciddimethylarsenic acid (CH3)2AsO2H, a herbicide and organoarsenic compound
- 甲基安非他命 jiǎjī'ānfēitāmìng methamphetamine
- 甲基苯丙胺 jiǎjīběnbǐng'àn methamphetamine
