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In the title compound, C10H11FN3O3S, the 2-fluorobenzoyl and proponic acid groups maintain a trans–cis conformation with respect to the thiono C=S bond across their C—N bonds. The propionic acid group adopts an anti conformation about the C—C bond, with an N—C—C—C torsion angle of 173.8 (2)°. The amino groups are involved in the formation of intramolecular N—H...O and N—H...F hydrogen bonds. In the crystal, pairs of O—H...O hydrogen bonds link molecules into inversion dimers.