Curculigoside C is a natural product of Curculigo, Amaryllidaceae. Curculigoside C can be used as a reference standard.

The G280-9 peptide, a common melanoma gp100 epitope restricted by MHC-associated HLA-A2. The G280-9 sequence is unique because it could be recognized by cytotoxic T lymphocytes at very low concentrations, however it shows low total immunogenicity that may be attributable to relatively low affinity of this peptide for the HLA-A2.

Methyl 5-hydroxy-1H-indole-3-carboxylate is a marine derived natural products found in Hyrtios erectus.