. "(E)-(1R,7S,11R,15S,17R)-11-Hydroxy-7-[(E)-(S)-1-hydroxy-3-((S)-4-methyl-3,6-dihydro-2H-pyran-2-yl)-allyl]-15-methyl-13-methylene-6,21-dioxa-bicyclo[15.3.1]henicosa-3,9,19-trien-5-one" . "21" . . . . .