peptide/protein cyclo(L-His-L-Pro) (3S,8aS)-3-[(1H-imidazol-5-yl)methyl]hexahydropyrrolo[1,2-a]pyrazine-1,4-dione 2025-06-20T12:41:03Z CHP CID:449094 This is any condition in which the main influencing factor is cyclo(L-His-L-Pro), 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). XCO:0001667 cyclo(L-histidyl-L-proline) cyclo(his-pro) cyclo(histidyl-proline) cyclo(prolylhistidine) experimental_condition_ontology histidylproline diketopiperazine, histidylproline dioxopiperazine slaulederkind