Corn May made it as far as 488 but overbought now and yesterday's candle formation indicates we will see profit taking in to the end of the week. The 200 day moving average at 479 will give us some clues on the close. Below here is more negative and below short term Fibonacci support at 477 adds pressure for a test of support at 471/470. If we continue lower look for 466/465 then good support at 461/460 and a bounce from here expected.
If we can hold on to the 479/478 area we could recover to 485 and possibly as far as 487/488. This should hold a move higher today, but an unexpected break higher could target 492/493.