1-[(4R,5R)-N2-(10,12-Dimethyl-N-tetradecyl)-4-hydroxy-5-(phenylthio)-L-ornithine]-pneumocandin B0 is an intermediate in the synthesis of Caspofungin Acetate, an echinocandin that inhibits the synthesis of β (1,3)-D-glucan, an integral component of the fungal cell wall.