You hold: ♠ - ♥ AK432 ♦ Q10542 ♣ K43

You should have a red-suit fit since partner has denied spades. West is about to raise spades, so you had better get your five-card diamond suit into the auction in case you have a big fit there. I would bid three diamonds here, but if I were using delicate modern science, I might be able to bid two no-trump as an artificial competitive maneuver. See acblunit390.org/Simon/good-bad-2nt.htm for more.