(1R,2S,5S,8S,9R,17R,18S,21S,24R,26S,27S)-5-hydroxy-2,9,26-trimethyl-3,19,23,28-tetraoxaoctacyclo[16.9.2.01,5.02,24.08,17.09,14.018,27.021,26]nonacosa-11,13,15-triene-4,10,22,29-tetrone