| Member | Definition | Role |
|---|
| brevianamide f | A pyrrolopyrazine that is hexahydropyrrolo[1,2-a]pyrazine-1,4-dione bearing an indol-3-ylmethyl substituent at position 3 (the 3S,8aS-diastereomer, obtained by formal cyclocondensation of L-tryptophan and L-proline). | brevianamide F |
| cyclo(leucyl-prolyl) | A homodetic cyclic peptide composed from leucyl and prolyl residues. | cyclo(L-Leu-L-Pro) |
| histidyl-proline diketopiperazine | A homodetic cyclic peptide resulting from the formal condensation of both the amino and acid groups of L-histidine with the acid and amino groups of L-proline. It is a metabolite of thyrotropin-releasing hormone (TRH). | cyclo(L-His-L-Pro) |
| maculosin | A homodetic cyclic peptide that is a dipeptide composed of L-proline and L-tyrosine joined by peptide linkages. | maculosin |
| tryprostatin a | A cyclic dipeptide that is brevianamide F (cyclo-L-Trp-L-Pro) substituted at positions 2 and 6 on the indole ring by prenyl and methoxy groups respectively. | tryprostatin A |
| tryprostatin b | A cyclic dipeptide that is brevianamide F (cyclo-L-Trp-L-Pro) substituted at position 2 on the indole ring by a prenyl group. | tryprostatin B |
| zopiclone | A pyrrolo[3,4-b]pyrazine compound having a 4-methylpiperazine-1-carboxyl group at the 5-position, a 5-chloropyridin-2-yl group at the 6-position and an oxo-substituent at the 7-position. | zopiclone |