We disclose here a new structural class of low-molecular-weight inhibitors of NF-κB activation that were designed and synthesized by starting from quinazoline derivative 6a. Structure–activity relationship (SAR) studies based on 6a elucidated the structural requirements essential for the inhibitory activity toward NF-κB transcriptional activation, and led to the identification of the 6-amino-4-phenethylaminoquinazoline skeleton as the basic ...