quaternium-15 molecule. skeletal formula.

quaternium15 molecule formula skeletal formaldehyde allergen allergic allergy ammonium atomic atoms carbon chemical chemistry chloride chlorine chloroallyl composition compound contact dermatologist dermatology drawing flat hexamethylenetetramine hydrogen icon laboratory line medical medicine molecular nitrogen patch preservative quaternary quaternium releaser research salt science sensitisation sensitiser sensitization sensitizer skin structure surfactant test