    New chain ID            Original chain ID

7wtq-pdb-bundle1.pdb:
           A                        C2
           B                        SB
           C                        SE
           D                        SG
           E                        SH
           F                        SI
           G                        SJ
           H                        SL
           I                        SN
           J                        SO
           K                        SW
           L                        SX
           M                        SY
           N                        Sb
           O                        Se
           P                        CA
           Q                        CB
           R                        CC
