1-Oxomiltirone

2-Isopropyl-8,8-dimethyl-7,8-dihydrophenanthrene-3,4,5(6H)-trione is a C20 -norabietane diterpenoid with anti-inflammatory activity. 2-Isopropyl-8,8-dimethyl-7,8-dihydrophenanthrene-3,4,5(6H)-trione can be isolated from sage leaves[1].