“…NOE were used in the structural assignment. Compounds 8 , 10 , 12 , 14 , 42 , 44 , 55 , 56 , 58a , and 59 were prepared according to corresponding literature procedures. HPLC analysis was conducted for all bioassayed compounds on an Agilent Technologies 1260 series LC system (Agilent ChemStation Rev.A.10.02; ZORBAX-C18, 4.6 mm × 150 mm, 5 μM, MeOH (0.1% DEA)/H 2 O, rt) with two ultraviolet wavelengths (UV 254 and 214 nm).…”