(12Z,14E,24Z)-5,17,19-trihydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,6,11-trioxo-1,2,6,7,10,11-hexahydro-2,8-(epoxytetradeca[1,11,13]trieno)[1]benzofuro[4,5-g]quinazolin-21-yl acetate