methyl (11beta,12alpha,15beta)-15-(((2E)-4-acetoxy-3,4-dimethyl-2-pentenoyl)oxy)-3,11,12-trihydroxy-2,16-dioxo-13,20-epoxypicras-3-en-21-oate
methyl (11beta,12alpha,15beta)-15-(((2e)-4-acetoxy-3,4-dimethyl-2-pentenoyl)oxy)-3,11,12-trihydroxy-2,16-dioxo-13,20-epoxypicras-3-en-21-oate