72548-29-9 Dehydrocrotonin Spiro(furan-3(2H),1'(7'H)-napthalene)-2,7'-dione, 2',3',4,4',4'a,5,8',8'a-octahydro-2',5'-dimethyl-5-(3-furanyl)-, (1'R-(1'-alpha(R*),2'-alpha,4'a-alpha,8'a-beta))-