    New chain ID            Original chain ID

8xot-pdb-bundle1.pdb:
           A                         B
           B                         b
           C                        B1
           D                        b1
           E                        B2
           F                        b2
           G                        B3
           H                        b3
           I                        B4
           J                        b4
           K                        B5
           L                        b5
