53683-70-8 Ailanthinone, dehydro- Dehydroailanthinone NSC 238188 Picrasa-3,13(21)-diene-2,16-dione, 11,20-epoxy-1,11,12-trihydroxy-15-(2-methyl-1-oxobutoxy)-, (1beta,11beta,12alpha,15beta)-