fumaric acid, c4h4o4, molecule. it is unsaturated dicarboxylic acid, food additive e297. structural chemical formula on the dark

acid acidulent additive atom atomic blue bolete boletic c4h4o4 carbon carboxylic chemical chemistry dark donitic drawing e297 flat food formula fumarase fumarate fumaria fumaric fumitory hydrogen iceland icon illustration lichen lichenic molecular molecule moss mushroom organic oxygen structural structure vector white