4 Nitro Phthalic Acid in Powder Form contains minimum 99% assay. 4 Nitro Phthalic Acid is used as bulk drugs intermediates as citalopram. 4 Nitro Phthalic Acid is soluble in alkaline medium. 4 Nitro Phthalic Acid in Powder Form can be melted at a temperature ranging from 160 Degree C to 162 Degree C.