V. A. Puchkov

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1. Free hydroxyacylamino acids and their methyl esters, and also free aminoacyloxy acids, morpholinize under mass spectrometry conditions. 2. In the mass spectrometry of methyl esters of aminoacyloxy acids and tert-butyl esters of aminoacyloxy acids and hydroxyacylamino acids no morpholinization takes place. These compounds behave similarly to the esters of(More)
1. The mass-spectrometric behavior of various cyclotetradepsipeptides of regular structure has shown that the CO2 type of fragmentation is most characteristic for them. 2. The results of the present investigation, with the regular features of the mass-spectrometric behavior of other types of cyclic depsipeptides [1] taken into account, permits an adequate(More)
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