Patent ID: 8710248

Claim:
A method of reducing tumor cell growth, the method comprising administering an effective amount of a compound having the formula: wherein R 11 is —H; R 5 is —H; and wherein the formula satisfies one of the following conditions (1) to (4): (1) each of R 2 and R 4 is —H, and each of R 12 , R 13 , R 21 , R 22 , and R 3 is a benzoate group; (2) each of R 13 , R 2 , and R 4 is —H, and each of R 12 , R 21 , R 22 , and R 3 is an acetate group; (3) each of R 13 , R 2 , and R 4 is —H, and each of R 12 , R 21 , R 22 , and R 3 is a benzoate group; (4) R 13 is —H, and each of R 12 , R 21 , R 22 , R 2 and R 3 , and R 4 is an acetate group.