    New chain ID            Original chain ID

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