Characteristic aroma nitrogen-containing compounds, including N-ethylsuccinimide, 2-acetylpyrrole, 2-formylpyrrole and 3-pyridinol, were consistently found in the examined old oolong teas. These compounds might be regarded as typical constituents at least for a certain kind of old oolong tea.
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Kuo et al. (2010) studied this question.
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