“…x 20.0 em, Kieselgel 60, 230-400mesh, Merck). Elution was done stepwise with CHCI 3 (lOOml), 2% (lOOml), 4,6,8,10,12,15,20,30, and 100% MeOH in CHCI 3 (each 50 ml). Strongly active eluates with 4 and 6% MeOH in CHCl 3 were combined into fraction P-I1-a (38mg).…”