Two new diketopiperazines and a new glucosyl sesterterpene from Alternaria alternata, an endophytic fungi from Ceratostigma griffithii

Two diketopiperazine derivatives, altenarizines A (1) and B (2), and a new glucosyl sesterterpene, 24-alpha-D-glucosyl-( - )- terpestacin (3), together with two known phytotoxic sesterterpenes, ( - )-terpestacin (4) and fusaproliferin (5), were isolated from the fermentation broth of an endophytic fungus Alternaria alternata, which was obtained from the fresh root of Ceratostigma griffithii. Structures of all the isolates were identified by spectroscopic data. (C) 2015 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved