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

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