Caspofungin acetate (MK-0991) is an antifungal lipopeptide compound targeting fungal cell wall synthesis by inhibiting 1 3- -D-glucan synthase thereby disrupting structural integrity This inhibition mechanism leads to the blockage of glucan polymer production essential for fungal growth In vitro analyses indicate Caspofungin acetate demonstrates antifungal activity against species including Aspergillus fumigatus and several Candida species with MIC90 values around 0 5 g/mL for C albicans and C parapsilosis 1 0 g/mL for C glabrata and C tropicalis and 2 0 g/mL for C krusei Caspofungin is utilized in biomedical research to explore cell wall synthesis pathways fungal susceptibility tests and mechanistic antifungal studies