56440-64-3

4,5-Secoakuammilan-5,17-dioicacid,19,20-epoxy-1,2,19,20-tetrahydro-2-hydroxy-4-methyl-16-[[(1-oxo-3-phenyl-2-propenyl)oxy]methyl]-,5,2-lactone, 17-methyl ester, (2a,20b)-