Sephadex LH20 (GE Healthcare), and COSMOSIL 75C18 and
140C18 (Nacalai Tesque) were used as adsorbents for open
column chromatographic experiments. Preparative HPLC purifications
were performed on a CXTH LC3000 HPLC system
(Beijing Chuangxintongheng Co., Beijing, China) equippedwith
a SIELC Primesep P semipreparative (10 × 250 mm, 5 μm)
column, eluting with acetonitrile/0.1% aq. formic acid isochratic
systems. Detection was done at 254 nm. All other chemicals
were purchased from Aldrich. Solvents used for general
purposes were of at least analytical grade, and solvents used
for HPLC experiments were of HPLC grade. Liquid chromatographic
(LC) analyses were performed on an Agilent 1200
infinity series Ultra High Performance Liquid Chromatography