Figure 1. Proposed reaction scheme showing formation of bluish-green chromogen

From

Design of Experiment Assisted UV-Visible Spectrophotometric and RP-HPLC Method Development for Ambrisentan Estimation in Bulk and Formulations

Shanta K. Adiki, Prashanti M, Baishakhi Dey, Prakash Katakam, Fathi H. Assaleh, Nagiat T. Hwisa, Rajeev K. Singla, Babu R. Chandu

World Journal of Analytical Chemistry. 2014, 2(2), 23-30 doi:10.12691/wjac-2-2-2