IUPAC Name: (2R)-2-[(2S,3S)-3-[(1R)-1-[Tert-butyl(dimethyl)silyl]oxyethyl]-4-oxoazetidin-2-yl]propanoic acid
Following is the structure of Side chain for imipenem (CAS NO.90776-58-2):
       
Molecular Formula: C₁₄H₂₇NO₄Si
Molecular Weight: 301.45 g/mol
Density: 1.05 g/cm³
Flash Point: 210.5 °C
Index of Refraction: 1.47
Melting point: 146-147 °C
Surface Tension: 32.5 dyne/cm
Enthalpy of Vaporization: 74.46 kJ/mol
Boiling Point: 424.4 °C at 760 mmHg
Vapour Pressure: 2.16E-08 mmHg at 25 °C 
Product Categories of Side chain for imipenem (CAS NO.90776-58-2): Pharmaceutical Intermediates; Intermediatesofmeropenam; Api intermediates; (intermediate of meropenem); Amides (Chiral); Azetidines; Chiral Building Blocks; Monoalkoxysilanes; Si (Classes of Silicon Compounds); Simple 4-Membered Ring Compounds; Si-O Compounds; Synthetic Organic Chemistry; Chiral Compound
SMILES: O=C(O)[C@@H]([C@H]1NC(=O)[C@@H]1[C@H](O[Si](C(C)(C)C)(C)C)C)C
InChI: InChI=1/C14H27NO4Si/c1-8(13(17)18)11-10(12(16)15-11)9(2)19-20(6,7)14(3,4)5/h8-11H,1-7H3,(H,15,16)(H,17,18)/t8-,9-,10-,11-/m1/s1
InChIKey: NNANGMFTFSNDLW-GWOFURMSBX

 Side chain for imipenem , its cas register number is 90776-58-2. It also can be called (3S,4S)-3-((R)-(tert-Butyldimethyl-silyloxy)ethyl)-4((R)-carboxyethyl)-2-azetidinone ; (3S,4S)-4-[(R)-1-carboxyethyl]-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone ; and beta-Methylazetidin-2-one .