    New chain ID            Original chain ID

8xxl-pdb-bundle1.pdb:
           A                        Ln
           B                        S2
           C                        SA
           D                        SB
           E                        SD
           F                        SE
           G                        SF
           H                        SH
           I                        SI
           J                        SK
           K                        SL
           L                        SP
           M                        SQ
           N                        SR
           O                        SS
           P                        ST
           Q                        SU
           R                        SV
           S                        SX
           T                        Sa
           U                        Sc
           V                        Sd
           W                        Sg
           X                        SC
           Y                        SG
           Z                        SJ
           a                        SM
           b                        SN
           c                        SO
           d                        SW
           e                        SY
           f                        SZ
           g                        Sb
           h                        Se
           i                        Sf
           j                        CD
