Irisflorentin blocks apoptosis pathways, by exerting its effects by promoting rpn-3 expression to enhance the activity of proteasomes and down-regulating egl-1 expression.

Levitide is a neurohormone-like peptide, can be isolated from skin secretions of the South African frog Xenopus laevis. Levitide comes from preprolevitide, is 88 residues long and contains contains the levitide peptide at the C terminus (Glu-Gly-Met-Ile-Gly-Thr-Leu-Thr-Ser-Lys-Arg-Ile-Lys-Gln-NH2) and the putative signal sequence at the N terminus.

(25R)-Spirost-4-ene-3,12-dione is a natural product.