速激肽家族的一种肽类神经递质，通过 NK-2 受体发挥作用。在人气道和胃肠道组织中作为主要的介体。

Crocin-4，一种类胡萝卜素，是有效和可透过血脑屏障的抗氧化剂。Crocin-4 可以抑制 Aβ 原纤维在脑中的聚集和伴随沉积。Crocin-4 可用于阿尔茨海默症的研究。Crocin-4 还具有抗肿瘤和抗炎活性。

[Tyr3]Octreotate is a long peptide compound containing 8 amino acids and is a functional DOTA chelating agent with covalent bonds. [Tyr3]Octreotate binds to transmembrane receptors of SSR2-active NETs and is actively transported into cells by endocytosis, which may increase the required double-stranded DNA breaks and is a potential drug for tumor treatment.