Insert colon between 2 columns and print other columns

Hi all,

Here is my data structure.

rs123456   1    78910 ABCD 12838

I want to add a colon between columns 2 and 3 and make it the first column so it will look like this.

1:78910  1    78910 rs123456  ABCD 12838

I am using the following code, but I am getting an error message. Can someone help me?

awk '{print "$2":$3", $1, $2,$3,$4,}' file 1.txt > file2.txt
awk: cmd. line:1: {print "$2":$3", $1,$2,$3,$4,$5}
awk: cmd. line:1:            ^ syntax error
awk: cmd. line:1: {print "$2":$3", $1, $2,$3,$4,$5}
awk: cmd. line:1:               ^ unterminated string

Do

awk '{print $2":"$3, $1, $2,$3,$4,}' file 1.txt

Thank you!

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Absolutely no problem.