Cell-permeable, phenylcyclohexyl-urea based compound that selectively downregulates the expression of p21, independent of p53 expression, at either transcription or post-transcriptional level. Attenuates p21 protein levels with minimal effect on p21 protein stability. Has no significant effect on the activities of Raf kinases, VEGFR2 kinase, or the phosphorylation state of ERK. Effectively inhibits the growth of multiple cancer cell lines (GI₅₀ = ~ 10 μM against NCI60 cell lines).