Hong-Wu He

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Garcinia xanthochymus has been widely used in traditional Chinese medicine for expelling worms and removing food toxins. Bioassay-guided fractionation of an EtOAc-soluble extract of G. xanthochymus stem bark led to the isolation of six new xanthones. Their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques.(More)
BACKGROUNDS In insects, cholesterol is one of the membrane components in cells and a precursor of ecdysteroid biosynthesis. Because insects lack two key enzymes, squalene synthase and lanosterol synthase, in the cholesterol biosynthesis pathway, they cannot autonomously synthesize cholesterol de novo from simple compounds and therefore have to obtain(More)
In the title compound, C(26)H(23)ClFN(5)O(2)S(2), the mean plane of the guanidine fragment makes dihedral angles of 58.94 (13), 78.37 (17) and 50.76 (15)°, respectively, with the attached thia-zole, pyridine and phenyl rings. The crystal structure features N-H⋯S and C-H⋯O hydrogen bonds and weak π-π stacking inter-actions [centroid-centroid separation =(More)
In the title compound, C(34)H(18)Cl(2)F(6)O(6), one terminal trifluoro-methyl and one entire 2-chloro-4-(trifluoro-meth-yl)phenyl group are disordered with refined occupancy ratios of 0.715 (11):0.285 (11) and 0.517 (5):0.429 (5), respectively. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into ribbons propagating along the(More)
In the crystal structure of the title mol-ecule, C(13)H(18)BrO(4)P, the phospho-nate ring adopts a chair conformation. Mol-ecules are linked by an O-H⋯O hydrogen bond [O⋯O = 2.780 (3) Å] to form chains parallel to the c axis. Two C-H⋯O inter-actions help to stabilize the crystal structure.
In the title mol-ecule, C(21)H(13)F(6)N(3)O(2), the pyridine ring forms dihedral angles of 1.7 (1) and 5.2 (1)° with the two benzene rings. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds and π⋯π inter-actions [centroid-centroid distance of 3.628 (3) Å between aromatic rings] link mol-ecules into stacks along the c axis. The two(More)
In the crystal structure of the title compound, C(14)H(14)F(3)O(7)P, the central chain, which connects the phosphate bicyclic system and the benzene ring, is made up of an approximately planar C-C(O)-O-C(H(2)) fragment and a C(H(2))-O-C(Ph) link; the mean planes make a dihedral angle of 75.9 (2)°. The F atoms are disordered over two positions; the site(More)