... Organic Process Research & ... A key portion of the development of a commercial synthesis is the identification of all impurities in the drug substance and later intermediates. ... The first method attempted was to examine all isolated process intermediates for an “M + 14” impurity. ...
![4,6-dimethoxy-1,3,5-triazin-2-yl 4-(2-(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzoate结构式](https://image.chemsrc.com/caspic/218/1209465-70-2.png)
![N-(4-(2-(2-氨基-4-氧代-4,7-二氢-3H-吡咯并[2,3-d]嘧啶-5-基)乙基)苯甲酰基)-L-谷氨酸二乙酯结构式](https://image.chemsrc.com/caspic/145/146943-43-3.png)
![N-(4-[2-(2-氨基-4,7-二氢-4-氧-1H-吡咯[2,3-D]嘧啶-5-基)乙基]苯甲酰)-L-谷氨酸二乙酯对甲苯磺酸盐结构式](https://image.chemsrc.com/caspic/398/165049-28-5.png)