Text this: High-Yield Synthesis of <i>N</i>⁴-(3-Chloro-4-fluorophenyl)-7-((4-methoxybenzyl)thio)quinazoline-4,6-diamine via <i>N</i>-(3-Chloro-4-fluorophenyl)-7-((4-methoxybenzyl)thio)-6-nitroquinazolin-4-amine