- Nodulisporic acids D-F: structure, biological activities, and biogenetic relationships. Singh, S.B., Ondeyka, J.G., Jayasuriya, H., Zink, D.L., Ha, S.N., Dahl-Roshak, A., Greene, J., Kim, J.A., Smith, M.M., Shoop, W., Tkacz, J.S. J. Nat. Prod. (2004)