Add new route in Restful route and use this in form Laravel

I added a new route for a restful controller:

Route::get('admin/store_productos', 'AdminController@store_productos');
Route::resource('admin', 'AdminController');

And I use it in a form:

{!!Form::open([
    'route' => 'admin.store_productos', 
    'method'=> 'POST',
    'files' => true])!!}
   <div class="row">
    {!!Form::text('name', null, ['class' => 'input-field col s12', 'placeholder' => 'Inserte Nombre del articulo'])!!}
  </div>

  <div class="row">
    {!!Form::text('precio', null, ['class' => 'input-field col  s12', 'placeholder'=>'Inserte precio del articulo'])!!}
  </div>

  <div class="row"> 
    {!!Form::text('descripcion', null, ['class' => 'input-field col  s12', 'placeholder'=>'Inserte descripcion del articulo'])!!}
  </div>

  <div class="row">
    {!! Form::file('path') !!}
  </div>
  {!! Form::submit('Registrar', ['class' => 'btn btn-primary']) !!}
{!! Form::close() !!}

But I'm getting this error:

Route [admin/store_productos] not defined

I don't know what's happening.

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