The reaction mixture was cooled, and diluted with EtOAc : water 1:1. The organic layer was separated and dried over Na2SO4. Removal of sovent under reduced pressure left a sticky brown oil which was dissolved in hot aq. NaOH and filtered. The filtrate on acidification with 5% H2SO4 gave greenish yellow solid. The rwsidue was then purified by flash column chromatography to give greenish yellow solid of 1,3-dihydroxyacridin-9(10H)-one