    New chain ID            Original chain ID

7ug7-pdb-bundle1.pdb:
           A                        16
           B                        SB
           C                        SC
           D                        SD
           E                        SE
           F                        SF
           G                        SG
           H                        SH
           I                        SI
           J                        SJ
           K                        SK
           L                        SL
           M                        SM
           N                        SN
           O                        SO
           P                        SP
           Q                        SQ
           R                        SR
           S                        SS
           T                        ST
           U                        SU

7ug7-pdb-bundle2.pdb:
           A                        23
           B                         5
           C                        LA
           D                        LB
           E                        LC
           F                        LD
           G                        LE
           H                        LF
           I                        LI
           J                        LJ
           K                        LK
           L                        LM
           M                        LN
           N                        LO
           O                        LP
           P                        LQ
           Q                        LR
           R                        LS
           S                        LT
           T                        LU
           U                        LV
           V                        LW
           W                        LX
           X                        LY
           Y                        La
           Z                        Lb
           a                        Lc
           b                        Ld
           c                        Le
           d                        Lf
           e                        Lg
           f                        Lh
           g                        Li
           h                        Lj
           i                        EF

7ug7-pdb-bundle3.pdb:
           A                        Dt
           B                        Pt
           C                        mR
           D                         B
