Chain identifier should be blank not A: ATOM   2554 ZN    ZN A 323      46.740 434.150 515.810 81.00 19.80      A   ZN  
Chain identifier should be blank not B: ATOM   2592 ZN    ZN B 324      78.370 840.220 329.440 21.00 26.60      B   ZN  
Chain identifier should be blank not A: ATOM   2555 ZN    ZN A 325      55.490 538.710   8.310  1.00 16.60      A   ZN  
Chain identifier should be blank not B: ATOM   2593 ZN    ZN B 326      68.410 840.750 137.500 91.00 20.20      B   ZN  

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