    New chain ID            Original chain ID

9o3t-pdb-bundle1.pdb:
           A                       III
           B                       AAA
           C                       BBB
           D                       CCC
           E                       DDD
           F                       EEE
           G                       FFF
           H                       GGG
           I                       HHH
           J                       JJJ
           K                       KKK
           L                       LLL
