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Acknowledgements
This work is supported by grants of the National Basic Re-
search Program of China (973 Program, Grants
2006CB504200, 2006CB504202), the National Science and
Technology Major Project “Development of key technologies
for the combinatorial synthesis of privileged scaffolds”
(2009ZX09501-012), the National Science Foundation of
China (20325208 and 20521202), and the Shenzhen munici-
pal “Shuang Bai Project” (to Junmin Quan).
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