(5S,6S,8Z,11S)-5,6,15-trihydroxy-17-methoxy-11-methyl-12-oxabicyclo[12.4.0]octadeca-1(14),8,15,17-tetraene-7,13-dione (5S,6S,8Z,11S)-5,6,15-trihydroxy-17-methoxy-11-methyl-12-oxabicyclo[12.4.0]octadeca-1(14),8,15,17-tetraene-7,13-quinone