[(8,8-DImethyl-2-oxo-4-phenyl-9,10-dihydro-2h,8h-pyrano[2,3-f]chromen-5-yl)oxy]acetic acid 1g

[(8,8-DImethyl-2-oxo-4-phenyl-9,10-dihydro-2h,8h-pyrano[2,3-f]chromen-5-yl)oxy]acetic acid 1g