Amine conjugates of the semi-synthetic 1,3-beta-(D)-glucan synthesis inhibitors L-731,373 (3) and L-733,560 (4) were prepared and evaluated for in vitro and in vivo antifungal activity. Tricationic analogs were more potent than the dicationic which were more potent than the monocationic. The L-ornithine conjugate of 4 possessed excellent pharmacokinetic parameters but lacked sufficient antifungal spectrum for development. (C) 1997 Elsevier Science Ltd.