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XY-4 is a chemically modified analog of 2-palmitoyl lysophosphatidic acid (LPA), featuring two fluorine atoms in place of the hydroxyl group at the sn-1 position. This structural alteration gives the molecule potent activity as a selective pharmacological agent. It functions as an antagonist or inverse agonist specifically targeting the LPA1, LPA2, and LPA3 receptor subtypes.