A new chromene derivative, alternapyran (1), along with three known compounds (2–4), was isolated from the Alternaria sp. ZG22 obtained from a Dasymaschalon rostratum collected from the Hainan. The structure of the new compound 1 was elucidated by NMR and mass spectroscopic data. Compounds 2 and 3 showed broad spectrum antibacterial activity against four terrestrial pathogenic bacteria.

中文翻译：

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来自 Alternaria sp. 的新 Chromene 衍生物。ZG22

从 Alternaria sp. 中分离出一种新的色烯衍生物交替吡喃 (1) 以及三种已知化合物 (2-4)。ZG22 取自海南采集的 Dasymaschalon rostratum。通过核磁共振和质谱数据阐明了新化合物1的结构。化合物2和3对四种陆生致病菌显示出广谱抗菌活性。