Cho 1 mol amino axit X phản ứng với dung dịch HCl (dư), thu được m₁ gam muối Y. Cũng 1 mol amino axit X phản ứng với dung dịch NaOH (dư), thu được m₂ gam muối Z. Biết m₂ − m₁ = 7,5. Công thức phân tử của X là:

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