A cell-permeable isoxazoloamide compound that specifically inhibits DAF-9 activity in C. elegans (~20uM) without affecting the activity of DAF-12 and sterol- and oxysterol-metabolizing P450s. Reversibly targets the catalytic heme iron of DAF-9 cytochrome p450 and induce a constitutive dauer (Daf-c), distal-tip cell migration (Mig) and protruding vulval (Pvl) phenotypes in wild-type C. elegans (at ~25uM). Also, shown to be one of the most potent inhibitors of CYP27A1, the mammalian ortholog of DAF-9. Robustly promotes dauer formation (non-aging stress-resistant alternative third larval stage) only in wild type C. elegans and extends their life span by about 29%.