I would check the river. You will not make a better hand fold, you have the opportunity to get to the river cheaply, and you may induce a bluff. If I check, the UTG bets, and the SB calls, I fold, as one of them has you beat. If the UTG bets, the SB folds, I call, as he may have something like AK. I'd put the SB on a club draw, or maybe some sort of straight draw, and the UTG on overcards.