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                                        Comment: The structure for tibremciclib was obtained from proposed INN list 129 (August 2023) where it is described as a cyclin-dependent kinase inhibitor and antineoplastic agent. From patent analysis it appears to be a dual CDK4/6 inhibitor, a mechanism that is validated as a cancer therapy. CDK4/6 inhibition blocks the cell cycle at G1 phase and inhibits tumour cell proliferation.
                                    
                                 
                            
                            
                          
                                
                                    
                             
                                    
                                   
                                                 
                            
                             
                        
                                
                          
                                   
                                   
                                  
                                    
                                    
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                                                    2D Structure   
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                                                    Physico-chemical Properties   
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                                                            Hydrogen bond acceptors
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                                                            8
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                                                            Hydrogen bond donors
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                                                            1
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                                                            Rotatable bonds
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                                                            6
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                                                            Topological polar surface area
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                                                            71.19
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                                                            Molecular weight
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                                                            518.61
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                                                            XLogP
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                                                            0.91
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                                                            No. Lipinski's rules broken
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                                                            1
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                                                            Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/) 
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                                                    SMILES / InChI / InChIKey   
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                                                                Canonical SMILES
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                                                                CCN1CCN(CC1)CC2=CC=C(N=C2)NC3=NC=C(C(=N3)C4=CC5=C(C(=C4)F)N=C6CCC[C@@H](C)N56)F
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                                                                Isomeric SMILES
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                                                                C(C)N1CCN(CC1)CC=2C=CC(=NC2)NC3=NC=C(C(=N3)C=4C=C(C5=C(N6C(=N5)CCC[C@H]6C)C4)F)F
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                                                                InChI
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                                                                InChI=1S/C28H32F2N8/c1-3-36-9-11-37(12-10-36)17-19-7-8-24(31-15-19)33-28-32-16-22(30)26(35-28)20-13-21(29)27-23(14-20)38-18(2)5-4-6-25(38)34-27/h7-8,13-16,18H,3-6,9-12,17H2,1-2H3,(H,31,32,33,35)/t18-/m1/s1
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                                                                InChI Key
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                                                                XOJPAVACYRFOBK-GOSISDBHSA-N
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                                                            Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/) 
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