4-[1-(3-carboxy-4-hydroxy-1-naphthyl)-3-oxo-1H,3H-naphtho[1,8-cd]pyran-1-yl]-1-hydroxy-6-(octadecyloxy)-2-naphthoic acid

4-[1-(3-Carboxy-4-hydroxynaphthalen-1-yl)-3-oxo-1H,3H-naphtho[1,8-cd]pyran-1-yl]-1-hydroxy-6-(octadecyloxy)-2-naphthalenecarboxylic acid