A derivative and metabolite of coumarin with diverse biological activities inhibits growth of human ACHN renal A549 lung HCT15 colon and LNCaP prostate carcinoma as well as Dakiki myeloma and HL-60 lymphoma cells at 250-300 Ug/ml increases ROS production and halts the cell cycle in KB human oral carcinoma cells has antidepressant-like activity in a rat model of depression induced by chronic unpredictable mild stress at 15 and 30 mg/kg used as a ratiometric pH indicator with ex/em 330 and 370/460 nm at low and high pH respectively