Help with Unknown Identifier error 'Keycode'

i am trying to make a code where once i press Escape on my keyboard it switches the scene to my main menu i have set up but it keeps giving me this error Assets/Scripts/menuScript.js(3,21): BCE0005: Unknown identifier: ‘Keycode’.

function Update () { if(Input.GetKey(Keycode.Escape)) %|-73974908_2|% }

“KeyCode”