[racket] help with syntax-splicing in small macro

Hello list.

Could anyone give me a hand and explaing why this

#lang racket
(struct tst (attr1 attr2))

(define-syntax (list->struct stx)
  (syntax-case stx ()
    [(_ attr-list) #`(tst #, at attr-list)]))

Fails?

-- 
Eduardo Bellani

"Resolve to serve no more, and you are at once freed."