6-Hydroxy-2-naphthoic acid16712-64-430 % similar 6-Propyl-2-naphthol2776-56-930 % similar 6-Hydroxycoumarin6093-68-130 % similar 6-Hydroxy-2-methylquinoline613-21-830 % similar 2-Naphthol-6-sulfonic acid93-01-630 % similar