A new diphenyl ether, named praesorether P (1), was isolated from the lichen Parmotrema praesorediosum (Nyl.) Hale. Its chemical structure was elucidated on the basis of extensive spectroscopic analysis including HR-ESI-MS and NMR as well as comparison with previously published data.

中文翻译：

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来自地衣Parmotrema praesorediosum 的新二苯醚

从地衣Parmotrema praesorediosum (Nyl.) Hale 中分离出一种名为 praesorether P ( 1 )的新二苯醚。其化学结构是基于广泛的光谱分析（包括 HR-ESI-MS 和 NMR）以及与先前公布的数据进行比较而阐明的。