A miniature in the Sicilian Taimanov Four Knights

Hello everybody,

today I want to share a game that was surprisingly short. Usually the Sicilian is the somewhat best choice for black against 1. e4. Here black chose an aggressive line in the "Four Knights"-Variation of the Taimanov: 

 So, what did black do wrong here?  Here is a similar game in which black did better but finally lost, mainly due to the better pawn structure white had.