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                                Bis-PEG6-acid                            
                        
                        
                                                            Catalog No.:M0107057 Spec/Purity:97% CAS No.: 119189-70-7 Molecular Weight:382.4 
 
 
 
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                                PEG6-(CH2CO2H)2                            
                        
                        
                                                            Catalog No.:M0108081 Spec/Purity:97% CAS No.: 77855-76-6 Molecular Weight:354.35 
 
 
 
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                                Bis-PEG4-acid                            
                        
                        
                                                            Catalog No.:A015534 Spec/Purity:98% CAS No.: 31127-85-2 Molecular Weight:294.3 
 
 
 
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