Miscalculation…!! (誤算…!!, Gosan…!!) is chapter 270 of the Naruto manga.
Temari and Kankurō depart from Sunagakure, intending to finally join the effort to rescue Gaara. Naruto and Kakashi meanwhile are still struggling to get Gaara's body back from Deidara. Elsewhere, Sasori grows tired of Sakura's continued success with dodging the Third Kazekage's attacks, so covers the area in Iron Sand. She is injured and collapses, the Iron Sand having been soaked in Sasori's poison. The Third moves in to finish her off but Sakura gets up at the last minute and destroys the puppet. Sakura reveals to Chiyo that she gave herself the antidote she created earlier, and is now immune to the poison for the next three minutes. She gives the last vial of antidote to Chiyo and encourages her to end the battle before they need to use it too.