(3β)-3-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]androst-5-en-17-one is used in the synthesis of a series of novel steroidal 5α,8α-endoperoxide derivatives, which possessed anti-proliferative inhibitory and cytotoxic activity;Also, it is an intermediate used in the synthesis of 3β-Hydroxyandrosta-5,15-dien-17-one (H750020), which is used in the preparation of Drospirenone.