Chain identifier should be blank not A: ATOM   1173 ZN    ZN A1397      40.470 324.530 652.030 41.00 13.60      A   ZN  
Chain identifier should be blank not B: ATOM   1193 ZN    ZN B1398      29.440 672.1701101.860 21.00 16.00      B   ZN  

1