Showing structure for 12-acetyl-9,13,17-trihydroxy-5,10,16,21-tetramethoxy-13-methylpentacyclo[13.8.0.0²,¹¹.0³,⁸.0¹⁸,²³]tricosa-1(23),2,5,8,10,15,17,20-octaene-4,7,19,22-tetrone