Repeat chromatography of the first and second
fraction on CC and preparative TLC using CH2Cl2 as
mobile phase (3 runs) gave 10 (7.5 mg) and 5 (8.6 mg)
as a yellow solid. Preparative TLC of the third fraction,
developed by CHCl3 (3 runs) gave 5 and 11 (38.6 mg)