[D-Trp2,7,9] Substance P

[D-Trp2,7,9] Substance P is a tachykinin (Neurokinin Receptor) antagonist with inhibitory affinities (K_i values) of 1 μM for NK-1, 1.3 μM for NK-2, and approximately 9 μM for NK-3 receptors [1].

CSCC[C@H](NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H]1CCCN1C(=O)[C@H](CCCCN)NC(=O)[C@@H](Cc1c[nH]c2ccccc12)NC(=O)[C@@H](N)CCCNC(N)=N)C(N)=O