This chemical is an amino acid called L-theanine.

这种化学物质是一种叫做L -茶氨酸的氨基酸。

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Instead, buy a brand called Suntheanine, which is pure L-theanine.

因此，（可以）买Suntheanine牌子的茶饮，它是纯L-茶氨酸制成的。

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However, green tea doesn't contain enough L-theanine to significantly boost your REM cycles.

然而，绿茶里没有足够的L -茶氨酸来提升你的睡眠周期。

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