To purify repanol, 16.1 g of the ethyl acetate extract was dried under argon at room temperature for 1.5 hours. The oily red residue remaining was resuspended in 1.5 mL of a 60:40 mixture of methanol/water containing 0.1% formic acid. This suspension was loaded onto a preparative HPLC (Agilent) with a Clippeus C18 column, 250 mm x 10 mm, with 5 µm particles. Isocratic HPLC using a mobile phase of methanol:water 60:40, with 0.1% v/v formic acid, and a flow rate of 4.7 mL/ min, afforded the compound of interest in a fraction eluting between 10 and 12 minutes. As ascertained by UV traces at 230 nm 270 nm, this fraction was free from contaminating material.