24-Diamino-6-hydroxypyrimidine (DAHP) is a selective specific inhibitor of GTP cyclohydrolase I the rate limiting step for de novo pterin synthesis.

Cecropin B (free acid) is a polypeptide that can be found by peptide screening. Peptide screening is a research tool that pools active peptides primarily by immunoassay. Peptide screening can be used for protein interaction, functional analysis, epitope screening, especially in the field of agent research and development.

2-Chloroindole is a marine derived natural products found in Ptychodera flava.