5-OXO-L-PROLYL-L-HISTIDYL-L-PROLINAMIDE. SYNTHETIC TRIPEPTIDE WITH THE SAME SEQUENCE OF AMINO ACIDS AS THE NATURAL HYPOTHALAMIC NEUROHORMONE, WHICH STIMULATES THE RELEASE AND SYNTHESIS OF THYROTROPIN. CONTENT: 97.0 PER CENT TO 102.0 PER CENT (ANHYDROUS AND ACETIC ACID-FREE SUBSTANCE)