base64 - @font-face with data URI in IE8 does not work -

I can not get my custom font in Internet Explorer 8 encoded with base64 in Internet UFO 8. These are my face CSS:

  @ font-face {font-family: 'myfont'; ('Data: font / eot; base64, [BASE_64_HERE]') format ('embedded-opera'); }   
 This works very well in Chrome but does not work in IE8.   
 
 
 I am pretty sure that 88 more than one source does not support declarations. After saying this, I am doing the same thing:  
  @ font-face {font-family: 'myfont'; Src: url format ('data: font / eot; base64, [BASE_64_HERE]') format ('embedded-opentype'); }   
 And it still does not work in ie8. I'm probably thinking a syntax issue? I hope someone else can help