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We prove that blowup solutions to this equation with initial data in $H^\\gamma(\\mathbb{R}^d), 5\\leq d \\leq 7, \\frac{56-3d+\\sqrt{137d^2+1712d+3136}}{2(2d+32)} <\\gamma<2$ concentrate at least the mass of the ground state at the blowup time. This extends the work in \\cite{ZhuYangZhang11} where Zhu-Yang-Zhang studied the formation of singularity for the equation with rough initial data in $\\mathbb{R}^4$. 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