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(12S,18Ξ,3E,5S,13E,15Z)-19-ethyl-15,7t,9c,11t-tetrahydroxy-5r-methoxy-12,4,8,6t,8c,10c,12t,16-octamethyl-19,10-dihydro-18H-2-oxa-1(2,7)-furo[2',3':5,6]benzo[1,2-g]quinazolina-cycloheptadecaphane-3,13,15-triene-11,6,11,17-tetraone