左乙拉西坦杂质   Levetiracetam impurity

ZYT-A  (S)-2-(2-oxopyrrolidin-1-yl)butanoic acid  102849-49-0

ZYT-B  (Z)-2-(2-oxopyrrolidin-1-yl)but-2enamide  358629-47-7

ZYT-C   pyridin-2-ol   142-08-5

ZYT-D   (R)-2-(2-oxopyrrolidin-1-yl)butanamide   103765-01-1

ZYT-E  (S)-N-(1-amino-1-oxobutan-2-yl)-4chlorobutanamide  102767-31-7

ZYT-F  methyl (S)-2-(2-oxopyrrolidin-1yl)butanoate  N/A

ZYT-G  ethyl (S)-2-(2-oxopyrrolidin-1yl)butanoate  N/A

ZYT-H   (S)-2-aminobutanamide hydrochloride  7682-20-4

ZYT-I   (S)-2-aminobutanoic acid   1492-24-6

ZYT-J   methyl (S)-2-aminobutanoate hydrochloride  15399-22-1

ZYT-K   (R)-2-aminobutanamide hydrochloride   103765-03-3

ZYT-L   4-chlorobutanoic acid   627-00-9

ZYT-N   ethyl 4-chlorobutanoate   3153-36-4

ZYT-O   dihydrofuran-2(3H)-one   96-48-0

ZYT-P   sodium 4-hydroxybutanoate   502-85-2
ZYT-Q  isopropyl (S)-2-(2-oxopyrrolidin-1yl)butanoate