    New chain ID            Original chain ID

7n1p-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
           V                        mR

7n1p-pdb-bundle2.pdb:
           A                        23
           B                         5
           C                        LB
           D                        LC
           E                        LD
           F                        LE
           G                        LF
           H                        LI
           I                        LJ
           J                        LK
           K                        LM
           L                        LN
           M                        LO
           N                        LP
           O                        LQ
           P                        LR
           Q                        LS
           R                        LT
           S                        LU
           T                        LV
           U                        LW
           V                        LX
           W                        LY
           X                        La
           Y                        Lb
           Z                        Lc
           a                        Ld
           b                        Le
           c                        Lf
           d                        Lg
           e                        Lh
           f                        Li
           g                        Lj
           h                        Pt
           i                        Pp
           j                        Dt
