title: Syntheses of pyroglutamylhistidylprolinamide and unusual mass fragmentation.
mesh_terms: D000577:Amides / Q000138:chemical synthesis; D004151:Dipeptides; D006639:Histidine; D013058:Mass Spectrometry; D008722:Methods; D010455:Peptides / Q000138:chemical synthesis*; D011392:Proline; D011760:Pyrrolidinones; D013973:Thyrotropin-Releasing Hormone / Q000138:chemical synthesis*
chemical_list: D000577:Amides; D004151:Dipeptides; D010455:Peptides; D011760:Pyrrolidinones; D006639:Histidine; D013973:Thyrotropin-Releasing Hormone; D011392:Proline