    New chain ID            Original chain ID

6qw6-pdb-bundle1.pdb:
           A                         X
           B                         4
           C                        41
           D                        42
           E                        43
           F                        4A
           G                        4B
           H                        4C
           I                        4D
           J                        4b
           K                        4e
           L                        4f
           M                        4g
           N                         5
           O                        51
           P                        52
           Q                        53
           R                        5A
           S                        5B
           T                        5C
           U                        5D
           V                        5J
           W                        5O
           X                        5X
           Y                        5b
           Z                        5e
           a                        5f
           b                        5g
           c                         6
           d                        62
           e                        63
           f                        64
           g                        65
           h                        66
           i                        67
           j                        68
           k                         R
           l                         S
           m                         U
