    New chain ID            Original chain ID

9sdq-pdb-bundle1.pdb:
           A                         2
           B                        BD
           C                        BF
           D                        BP
           E                        BQ
           F                        BS
           G                        BT
           H                        BU
           I                        Bc
           J                         d
           K                         e
           L                        BK
           M                        BR
