eight stereoisomers of eushearilide, including the natural compound, were synthesized relying on an asymmetric Mukaiyama aldol reaction, Julia–Kocienski olefination, and Shiina macrolactonization. Moreover, their in vitro antimicrobial activities against some fungi and bacteria were evaluated by the disk-diffusion method, which revealed that not only natural eushearilide but also its stereoisomers exhibited