Chemistry involves the study of all things chemical – chemical processes, chemical compositions and chemical manipulation – in order to better understand the way in which materials are structured, how they change and how they react in certain situations. Electric Literature of 24621-61-2,
[Problem] 2 tyrosine kinase mediated signal transduction inhibitor. (I) a pharmaceutically acceptable salt of the compound of the formula [a] and (In the formula, R1 , R2 , R3 , R4A , R4B , X1 , X2 , X3 , X4 , X5 And the n, as herein defined), pharmaceutical compositions containing the same, as well as preparation and use of the method, are disclosed herein. Figure 1 [drawing] (by machine translation)
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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate