Diplodialide A

(+)-Diplodialide A

(R,E)-7,8,9,10-Tetrahydro-10-methyl-2H-oxecin-2,4(3H)-dione

(5E,10R)-3,4,7,8,9,10-Hexahydro-10-methyl-2H-oxecin-2,4-dione