loop_
    _ma_struct_assembly.ordinal_id
    _ma_struct_assembly.assembly_id
    _ma_struct_assembly.entity_id
    _ma_struct_assembly.asym_id
    _ma_struct_assembly.seq_id_begin
    _ma_struct_assembly.seq_id_end
         1   1   1  A  1   726 
         2   1   2  B  1   744 
         3   1   3  C  1  1037 
         4   1   4  D  1  1157 
         5   2   1  A  1   726
         6   3   2  B  1   744
         7   4   3  C  1  1037
         8   5   4  D  1  1157 
         #...abbreviated...