fumaric acid molecular structure 3d, flat model, food additive e297, structural chemical formula view from a microscope

fumaric acid food additive e297 fumarates molecule molecular structure chemical formula model c4h4o4 atom dicarboxylic acids acidity regulators urea cycle chemistry science compound biology carbon oxygen atomic biochemistry hydrogen organic illustration icon fumarate composition laboratory medicine mushroom lichen carboxylic health bolete boletic fumaria bond education medical reaction flat structural view from microscope