	Dihydrotanshinone I (DI) is a naturally occurring compound extracted from "Salvia miltiorrhiza" Bunge, also known as Chinese sage, red sage root, and the Chinese herbal Dan Shen. It belongs to a class of lipophilic abietane biterpenoids and has been reported to have cytotoxicity to a variety of tumor cells. Since they were first discovered, over 40 related compounds and over 50 hydrophilic compounds have been isolated from Dan Shen.