    New chain ID            Original chain ID

9h7v-pdb-bundle1.pdb:
           A                        B1
           B                        B2
           C                        B3
           D                        B4
           E                        B5
           F                        B6
           G                        BA
           H                        BB
           I                        BC
           J                        BD
           K                        BE
           L                        BF
           M                        BG
           N                        BH
           O                        BI
           P                        BJ
           Q                        BK
           R                        BL
           S                        BM
           T                        BN
           U                        BO
           V                        QE
           W                        QF
           X                        QG
           Y                        QH
           Z                        QI
           a                        QJ
