NN1213 (Peptide 21) is a long-acting human amylin peptide analogue that functions as a selective amylin receptor agonist. It has an EC50 of 0.177 nM for hAMY3R and 0.262 nM for rAMY3R. In both rat and dog models, NN1213 significantly reduces appetite and is utilized in anti-obesity research.