It is produced by the strain of treptomyces griseus subsp. cryophilus, Str. sp. KC-6643. Carpetimycin is far more stable than Olivanic acid, and has very strong activity against gram-positive and negative bacteria (including β-lactamase producing bacteria). The activity of A is 8-32 times stronger than that of B. It has a strong inhibitory effect on β-lactamase.