Hydroxylamine reacts with acrylic acid via a triple Michael-addition forming the 3,3-bis-[2-carboxyethyl]-3-hydroxyaminopropionic acid betain (C9H15NO7). The crystal and molecular structures have been determined by X-Ray methods (P21/n; a = 8.097(2), b = 9.343(3), c = 14,647(4) Å, β= 91.35(3)°, Z = 4).
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