Chain identifier should be blank not A: ATOM   2634 ZN    ZN A 331      -1.210 625.700 753.160 11.00 16.30      A   ZN  
Chain identifier should be blank not B: ATOM   2674 ZN    ZN B 332      20.150  14.320 458.190 61.00 19.80      B   ZN  
Chain identifier should be blank not A: ATOM   2635 ZN    ZN A 333      -1.050 519.260 764.250 31.00 15.30      A   ZN  
Chain identifier should be blank not B: ATOM   2675 ZN    ZN B 334      15.410 812.500 367.570 91.00 16.70      B   ZN  

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