catechol molecule icons set color

allergen antioxidant atom atomic benzenediol biochemistry black bond c6h6o2 carbon catechol chain chemical chemistry collection compound crystal cycle cyclic dihydroxybenzene education element enzyme formula hydrocarbon hydrogen icon illustration isolated isomer macromolecule model molecular molecule organic ortho oxygen phenol photodeveloper pyrocatechol reagent reductant science set simple structural structure study synthetic vector white