my @name;
    my @details = (); 
    for my $row(0 ..$row_max) {    
        my $ligand_details = {};

      	for my $col (@required_cols) {
      		warn Dumper($worksheet); 
    	
      		my $cell = $worksheet->get_cell($row,$col);
      		warn $cell; 
      
      		my $value =  $cell ? $cell->val :'';

   			if($row == 0 ) {      				
    			$name[$col] = $value;
    		} else {
      			$ligand_details->{$name[$col]} = $value; 
      		}
      	}	
      	push @details , $ligand_details if (defined $row); 
   	}
    
   	return \@details;