It is produced by the strain of Str. hygroscopicus, Var. ossamyceticus C 8158 (ATCC 15420). It's a macrolide antibiotic. It has anti-fungal effect, and it has weaker anti-gram-positive bacterial effect. It inhibits L cells, Epstein-Barr ascites cancer cells, KB cells, sarcoma-180 cells, L-1210 cells, HeLa cells in cell culture with IC50 (μg/mL) of 0.007, 0.008, 0.005, 0.008, 0.003, 0.005, respectively. It has no antitumor effect in in vivo animal test.