diacetyl molecule, butanedione molecular structure, 3d model van der waals

diacetyl butanedione butane23dione molecule molecular structure chemical formula isolated model c4h6o2 atom atomic butter buttery chemistry hydrogen fermentation skeletal alcoholic margarine carbon oxygen illustration icon drawing compound science biacetyl butterscotch structural popcorn sign flat bronchiolitis diketone dimethyl element symbol inorganic obliterans organic research scientific favor flavor beverage van der waals