Five 6 mm-diameter plugs of T. harzianum SQR-T037 were ob-tained from actively growing margins of PDA cultures and inocu-lated in 5 L conical flasks containing 1 L of sterile potato dextrose broth, and the flasks were incubated at 28 _C with continuous shaking (170 rpm) for 6 days. The filtered culture broth (8 L) of T. harzianum SQR-T037 was extracted repeatedly (three times) with EtOAc. The combined organic extracts were dried with Na2SO4 and evaporated under reduced pressure at 40 _C. The brown residue recovered was re-dissolved in methanol and isolated with an Agi-lent 1200 semi-preparative HPLC (Agilent Technologies, Santa Clara, USA) equipped with a single-wavelength UV detector with an Agilent ZORBAX SB-C18 semi-preparative reverse-phase column (9.4 _ 150 mm, 5 mm) and an automatic fraction collector. The mobile phase was composed of 0.1% acetic aqueous solution and methanol at a ratio of 40:60 and used at a flow rate of 0.4 ml min_1, and the eluate was detected at 230 nm. Fractions from the same peak were combined and purified further using the Agilent 1200 semi-preparative HPLC as described above but with an Agilent ZORBAX Eclipse XDB-C18 analytical column (4.6 _ 250 mm, 5 mm).