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Ab initio calculations indicate that the ion [ONCO] − is linear, whereas [HNNCO] − is effectively coplanar. The ions may be formed by collisional activation of deprotonated hydroxy and aminocarbamates. The characteristic fragmentations of [ONCO] − and [HNNOO] − are losses of O and NH respectively.
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Waugh et al. (1989) studied this question.
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