(R,S) 1, 8-Dihydroxy-3-methyl-10-(3'-methyl-1'-oxo-2'-butenyl)-9(10H)-anthr acenone 1,8-Dihydroxy-3-methyl-10-(3-methyl-2-butenoyl)-9(10H)-anthracenone AIDS-137274 AIDS137274 NSC641169 Senecioylchrysarobin