Abstract Five sesquiterpene-α-amino acid quaternary ammonium hybrids and the sesquiterpene core with no amino acid moiety linked were isolated from the n-butanol partition of the Stereum complicatum fungal culture grown on potato dextrose broth. Chemical structures were unambiguously elucidated by high resolution electrospray ionization mass spectrometry (HR-ESI-MS) in positive ion mode and NMR experiments and were identified as sterostrein Q and stereumamides A - E. The isolation and structure elucidation of these hybrid compounds is reported herein for the first time from S. complicatum. The phytotoxic, antifungal and antibacterial activities of these compounds were evaluated, but no significant activity was found. The HR-ESI-MS fragmentation pattern of the sesquiterpene-α-amino acid quaternary ammonium hybrid metabolites and its chemotaxonomic implication are discussed.

中文翻译：

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来自复杂 Stereum (Steraceae) 的倍半萜烯-α-氨基酸季铵杂化物

摘要 从在马铃薯葡萄糖肉汤上生长的Stereum complicatum真菌培养物的正丁醇分区中分离出五个倍半萜-α-氨基酸季铵杂化物和未连接氨基酸部分的倍半萜核心。在正离子模式和核磁共振实验中，通过高分辨率电喷雾电离质谱 (HR-ESI-MS) 明确阐明了化学结构，并被鉴定为 sterostrein Q 和 stereumamides A - E。本文报道了这些杂化化合物的分离和结构阐明第一次来自 S. complicatum。评估了这些化合物的植物毒性、抗真菌和抗菌活性，但没有发现显着的活性。