Systematic variations of the xanthine scaffold in close analogs of development compound BI 1356 led to the class of 3,5-dihydro-imidazo[4,5-d]pyridazin-4-ones which provided, after substituent screening, a series of highly potent DPP-4 inhibitors.
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http://dx.doi.org/10.1016/j.bmcl.2008.04.075 | DOI Listing |
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