Fig. 6From: Smart stability indicating spectrophotometric methods for determination of modafinil: the promising treatment for post-covid neurological syndromeA Ratio spectra of laboratory prepared mixtures of modafinil and its degradation product using 70 µg/mL of its degradation product as a divisor. B The obtained ratio spectra after subtraction of the constant. C The obtained spectra of modafinil after multiplication by the divisor. D Second derivative of the obtained spectra of the laboratory prepared mixturesBack to article page