    New chain ID            Original chain ID

5tcu-pdb-bundle1.pdb:
           A                         A
           B                        SB
           C                        SC
           D                        SD
           E                        SE
           F                        SG
           G                        SF
           H                        SH
           I                        S1
           J                        S2
           K                        S3
           L                        S4
           M                        S5
           N                        S6
           O                        S7
           P                        S8
           Q                        S9
           R                        SI
           S                        SA
           T                         X
           U                         E
           V                         D

5tcu-pdb-bundle2.pdb:
           A                         B
           B                         C
           C                        L2
           D                        LC
           E                        LJ
           F                        LK
           G                        LL
           H                        LM
           I                        LN
           J                        LO
           K                        LP
           L                        LQ
           M                        LR
           N                        L1
           O                        L3
           P                        L4
           Q                        L5
           R                        L6
           S                        L7
           T                        L8
           U                        L9
           V                        LA
           W                        LB
           X                        LD
           Y                        LE
           Z                        LS
           a                        LG
           b                        LH
           c                        LI
           d                        LF
