![1'-(2-furoyl)spiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/49877.gif)
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![1'-isonicotinoylspiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/172652.gif)
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![1'-(3-imidazol-1-ylpropanoyl)spiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/51281.gif)
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![1'-[2-(2-ketopyrrolidino)acetyl]spiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/172656.gif)
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![1'-(3-ketoisoindoline-4-carbonyl)spiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/49720.gif)
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![1'-[3-(benzotriazol-1-yl)propanoyl]spiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/51501.gif)
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![1'-[2-(3-ketoisoindolin-1-yl)acetyl]spiro[1,3-dihydropyrido[2,3-d]pyrimidine-2,4'-piperidine]-4-one](http://zinc12.docking.org/img/rings/172653.gif)
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