Analysis of aliquots by C18-HPLC-DAD showed the 40% MeOH SPE fraction was enriched in compounds 1and 2. This fraction was processed to yield two 1.2 mL samples in 10% aqueous MeOH plus 0.02% H3PO4, which were injected in 80μL portions onto a Phenomenex Luna C18(2) column (5μm particle size,250 mm long, 4.6 mm i.d.) for isolation of compounds 1and2 using an HP 1100 Series HPLC system (Agilent Technologies) and a binary gradient consisting of 0.02% H3PO4 in H2O and MeOH as previously described by Ma et al