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For the purpose of discovering an orally available EP4 subtype-selective agonist, a series of 8-aza prostaglandin E(1) (PGE(1)) analogs were synthesized and evaluated for their affinity for PGE(2) receptor subtypes. Additionally, the structure-activity relationships of these compounds were studied. Among the tested compounds, the 8-aza PGE(1) analog 6 and 8-aza-5-thiaPGE(1) analog 12 had highly potent EP4 receptor affinity, good functional activity, and excellent subtype-selectivity. Furthermore, these analogs demonstrated good stability in human liver microsomes. As a result, we concluded that these two series of 8-aza PGE(1) analogs could be promising chemical leads for an orally available EP4 subtype-selective agonist.

Discovery of an 8-Aza-5-thiaProstaglandin E1 Analog as a Highly Selective EP4 Receptor Agonist