【化】 ketobutyric acid
oxygen
【医】 o; O2; oxy-; oxygen; oxygenium; phlogisticated gas
era; generation; take the place of
【电】 generation
【化】 butyrate; butyric acid; ethacetic acid; ethyl acetic acid
propane carboxylic acid
【医】 butanoic acid; butyric acid