MST-312(Telomerase Inhibitor IX) is an inhibitor of telomerase. MST-312 is a chemically modified derivative of green tea epigallocatechin gallate (EGCG). MST-312 exhibits high chemical stability, lowers the effective dose in the induction of telomere shortening, and lowers drug resistance. MST-312 can be used for the research of cancer. MST-312 can also be used as a promising strategy in the treatment of multiple myeloma (MM).