3-methyl-7-(2-butyn-1-yl)-8-[(R)-3-(tert-butyloxycarbonyl-amino)-piperidin-1-yl]-xanthine
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3-methyl-7-(2-butyn-1-yl)-8-[(R)-3-(tert.-butyloxycarbonylamino)-piperidin-1-yl]-xanthine
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3-methyl-7-(2-butyn-1-yl)-8-[(R)-3-(tert-butyloxycarbonylamino)-piperidin-1-yl]-2,6-dioxo-2,3,6,7-tetrahydro-1H-purine
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3-methyl-7-(2-butyn-1-yl)-8-[(R)-3-(tert-butyloxycarbonylamino)-piperidin-1-yl]-xanthine
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3-methyl-7-(but-2-yn-1-yl)-8-[(R)-3-(tert-butyloxycarbonylamino)-piperidin-1-yl]-xanthine
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3-methyl-7-(2-butyn-1-yl)-8-[(R)-3-(tert-butyloxycarbonylamino)-piperidin-1-yl]-3,7-dihydro-1H-purine-2,6-dione
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