the highly purified products ( da-4-o-s , ne-3-o-s , epi-3-o-s ) were characterized by their melting points ( mp ) , infrared spectra ( ir ) , thin-layer chromatography ( tlc ) , high-performance liquid chromatography ( hplc ) , elemental analysis , and 1h-nuclear magnetic resonance spectroscopy ( 1h-nmr ) .
C0028351
ne
C0014563
epi