Aminopeptidase inhibitor (IC50 values are 100, 150, 220, > 1000, > 5000, > 10000 and > 30000 nM for LAP, PuSA, aminopeptidase N, aminopeptidase B, PILSAP, LTA4 hydrolase and MetAP2 respectively). Potently inhibits tumor cell proliferation in a variety of tumor cell lines in vitro and in vivo.