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Chemical structures of CDK inhibitors: purvalanol A, WHI-P180, roscovitine, bohemine, and olomoucine. Chemical fragmentation codes involved in these CDK inhibitors were deduced by using the Markush TOPFRAG program (http://thomsonderwent.com/products/patentresarch/markushtopfrag/) (Derwent Information Ltd., London, UK) as described previously [47]. Information of each chemical fragmentation code is briefly summarized in Table 1.
