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27
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3142759659
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note
-
The low yield observed may well be due to methanolysis of the O-acetate under the reaction conditions.
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-
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28
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3142743439
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note
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28 to a carboxylic acid could lead to pyrazine bis-carboxylic acids and derivatives thereof.
-
-
-
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29
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3142755162
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note
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+], 828 (19), 732 (20), 154 (33) [NBA matrix].
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30
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3142767106
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