    New chain ID            Original chain ID

8qsi-pdb-bundle1.pdb:
           A                        PM
           B                        PN
           C                        PO
           D                        PP
           E                        PQ
           F                        PR
           G                        PS
           H                        PT
           I                        PU
           J                        PV
           K                        PW
           L                        PX
           M                        PA
           N                        PB
           O                        PC
           P                        PD
           Q                        PE
           R                        PF
           S                        PG
           T                        PH
           U                        PI
           V                        PJ
           W                        PK
           X                        PL
