11,13-Dehydrodesacetylmatricarin 14-Deoxylactucin 74635-52-2 Azuleno(4,5-b)furan-2,7-dione, 3,3a,4,5,9a,9b-hexahydro-4-hydroxy-6,9-dimethyl-3-methylene-, (3aR-(3aalpha,4alpha,9aalpha,9bbeta))-