Impurity Code

Impurity Name

Chemical Name

Chemical Structure

RT

in LCMS

MGI-1

β-Methyldiazo Azetidinone

(4-Nitrophenyl)methyl (γR,2R,3S)-α-diazo-3- [(1R)-1-hydroxyethyl]-γ-methyl-β, 4-dioxo-2-azetidinebutanoate

19.668

MGI-2

β-Methyl Azetidinone

(R)-2-((2S,3S)-3-((R)-1- ((tert-butyldimethylsilyl)oxy)ethyl)-4- oxoazetidin-2-yl)propanoic acid

20.237

MGI-3

Dihydrobenzoxazinone

Spiro[benzo[e][1,3]oxazine-2,1’- cyclohexan]-4(3H)-one

22.050

MGI-4

4-Acetoxy Azetidinone

(2R,3R)-3-((R)-1- ((tert-butyldimethylsilyl)oxy)ethyl)-4- oxoazetidin-2-yl acetate

23.850

MGI-5

Thiolactone

(1S,4S)-5-(4-nitrobenzyloxy-carbonyl)-2- thia-5-azabicyclo[2.2.1]heptane-3-one

24.515

MGI-6

Azetidinone Malonate Ester

(4-nitrophenyl)methyl (γR,2R,3S)-3-[(1R)-1-[[(1,1-dimethylethyl) dimethylsilyl]oxy]ethyl]-γ-methyl-β, 4-dioxo-2-azetidine butanoate

32.387

MGI-7

Diprotected Meropenem

4R,5S,6S)-4-nitrobenzyl 3-((3S,5S)- 1-((4-nitrobenzyloxy)carbonyl)-5-(dimethylcarbamoyl)pyrrolidin-3-ylthio)-6- ((R)-1-hydroxyethyl)-4-methyl-7-oxo-1- aza-bicyclo[3.2.0]hept-2-ene-2-carboxylate

32.550

MGI-8

Silylated β-Methyl diazo Azetidinone

4-nitrobenzyl (R)-4-((2R,3S)-3-((R)-1- ((tert-butyldimethylsilyl)oxy)ethyl)-4- oxoazetidin-2-yl)-2-diazo-3- oxopentanoate

34.096

MGI-9

2-Chlorodihydro Benzoxazinone

3-(2-chloropropanoyl)spiro[benzo[e][1,3]oxazine-2,1’-cyclohexan]-4(3H)-one

34.734

MGI-10

2-Bromodihydro Benzoxazinone

3-(2-bromopropanoyl)spiro[benzo[e][1,3]oxazine-2,1’-cyclohexan]-4(3H)-one

35.561