AngularJS how acces data nested Json?

I’m trying to get a “thumbnail” image of a post in wordpress.
But I am not able to access nested JSON data
I created a jsFiddle link so you can see an example and may finish my html and AngularJS controller.

I might have to create a filter. But I can not, I’m stuck.
The goal is to get that thumbnail nested and place it as an image src.

 {
        "ID": 45,
        "title": "Lista Generada",
        "status": "publish",
        "type": "post",
        "modified_gmt": "2015-03-11T21:04:47+00:00",
        "featured_image": 
    {
        "ID": 46,
        "title": "eCommerce-checklist",
        "status": "inherit",
        "type": "attachment",
        "is_image": true,
        "attachment_meta": 
    {
        "width": 1000,
        "height": 857,
        "file": "2015/03/eCommerce-checklist.jpg",
        "sizes": 
    {
        "medium": 
    {
        "file": "eCommerce-checklist-300x257.jpg",
        "width": 300,
        "height": 257,
        "mime-type": "image/jpeg",
        "url": "http://localhost/wp-content/uploads/2015/03/eCommerce-checklist-300x257.jpg"
    },
    "post-thumbnail":
                    {
                        "file": "eCommerce-checklist-825x510.jpg",
                        "width": 825,
                        "height": 510,
                        "mime-type": "image/jpeg",
                        "url": "http://localhost/wp-content/uploads/2015/03/eCommerce-checklist-825x510.jpg"
                    }
                },
            }
        },
    }