1-Methyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
7-Chloro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
7-Fluoro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
4-Methyl-2,3-dihydrofuro[2,3-b]pyridine
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![4-Methyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one](https://qncdn.chemcd.cn/ampyridine/AM249655.png)
![AM249654 | 67074-79-7 | 1-Methyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one](https://qncdn.chemcd.cn/ampyridine/AM249654.png "AM249654 | 67074-79-7 | 1-Methyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one")
![AM249653 | 1314912-26-9 | 7-Chloro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one](https://qncdn.chemcd.cn/ampyridine/AM249653.png "AM249653 | 1314912-26-9 | 7-Chloro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one")
![AM249652 | 1314968-89-2 | 7-Fluoro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one](https://qncdn.chemcd.cn/ampyridine/AM249652.png "AM249652 | 1314968-89-2 | 7-Fluoro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one")
![AM249651 | 121743-61-1 | 4-Methyl-2,3-dihydrofuro[2,3-b]pyridine](https://qncdn.chemcd.cn/ampyridine/AM249651.png "AM249651 | 121743-61-1 | 4-Methyl-2,3-dihydrofuro[2,3-b]pyridine")