(S)-3-(4-Hydroxyphenyl)-2-hydroxypropionic acid (compound 1) is a metabolite isolated from the culture medium of Leuconostoc mesenteroides.

Delta (Phospho) Sleep Inducing Peptide

Porcine dynorphin A (1-13) is a potent, endogenous κ opioid receptor agonist and is antinociceptive at physiological concentrations. Exposure to dynorphin A (1-13) causes acute increases in [Ca2+]i in individual neurons similar to increases seen with acute NMDA treatment.