It is produced by the strain of Str. lavendulae No 314. It has the effect of anti-Gram-positive bacteria, and Saframycin A has the strongest antibacterial activity. Saframycin A also has weak activity against gram-negative bacteria and mycobacteria. It has the effect of inhibiting mouse lymphocyte L-1210 with ID50 of 0.0056 μmol/L.