[(2,2-DImethyl-6-oxo-3,4,7,8,9,10-hexahydro-2h,6h-benzo[c]pyrano[2,3-h]chromen-11-yl)oxy]acetic acid 1g

[(2,2-DImethyl-6-oxo-3,4,7,8,9,10-hexahydro-2h,6h-benzo[c]pyrano[2,3-h]chromen-11-yl)oxy]acetic acid 1g