2-[[2-[(Z)-(4-Oxo-2-thioxo-5-thiazolidinylidene)methyl]-1-naphthalenyl]oxy]-acetic Acid is an analog of 2-[[1-[(Z)-(4-Oxo-2-thioxo-5-thiazolidinylidene)methyl]-2-naphthalenyl]oxy]-acetic Acid (O859575). 2-[[1-[(Z)-(4-Oxo-2-thioxo-5-thiazolidinylidene)methyl]-2-naphthalenyl]oxy]-acetic Acid is used in biological activities in the preparation and aldose reductase inhibitory activity of a new series of 5-[[2-(ω-carboxyalkoxy)aryl]methylene]-4-oxo-2-thioxothiazolidine derivatives. Molecular Formula: C16H11NO4S2 Molecular Weight: 345.39