Chain identifier should be blank not F: ATOM     40 MG    MG F 344      15.3007773.6007927.300681.00 41.00      F   MG  
Chain identifier should be blank not F: ATOM   2816 MG    MG F 344      19.100  78.4004226.200511.00 40.00      F   MG  
Chain identifier should be blank not F: ATOM     39 MG    MG F 345      18.441  75.990  24.386  1.00 39.18      F   MG  

1