    New chain ID            Original chain ID

5t7v-pdb-bundle1.pdb:
           A                         A
           B                        S1
           C                        S2
           D                        S3
           E                        S6
           F                        S7
           G                        S8
           H                        S9
           I                        SA
           J                        SC
           K                        SD
           L                        SE
           M                        SF
           N                         B

5t7v-pdb-bundle2.pdb:
           A                         C
           B                        L1
           C                        L2
           D                        L3
           E                        L4
           F                        L5
           G                        L6
           H                        L7
           I                        L8
           J                        L9
           K                        LA
           L                        LB
           M                        LC
           N                        LD
           O                        LE
           P                        LF
           Q                        LG
           R                        LH
           S                        LI
           T                        LJ
           U                        LL
           V                        LM
           W                        LN
           X                        LO
           Y                        LP
           Z                        LQ
           a                        LR
           b                         D
