(12E)-6,18,20-trihydroxy-14-methoxy-2,2,7,9,15,17,19,21,25-nonamethyl-5,10,26-trioxo-3-phenyl-3,5,9,10-tetrahydro-2H-9,4-(epoxypentadeca[1,11,13]trienoimino)furo[2',3':7,8]naphtho[1,2-d]imidazol-16-yl acetate