- Tirandalydigin, a novel tetramic acid of the tirandamycin-streptolydigin type. I. Taxonomy of the producing organism, fermentation and biological activity. Karwowski, J.P., Jackson, M., Theriault, R.J., Barlow, G.J., Coen, L., Hensey, D.M., Humphrey, P.E. J. Antibiot. (1992)