The present invention provides a compound of formula (I) as a SERCA inhibitor for treating cancers, a pharmaceutical composition comprising said compound, and methods of using said compound for treating cancers and/or inducing cell death in cells of said cancers. Said cancers include but not limited to cervical, lung, liver, breast, and prostate cancer. Said cancers also include drug-resistant and/or apoptosis-resistant cancers such as isogenic drug-resistant colon cancer. The subject being administered with said compound or the composition comprising thereof can be human or animal subject. Said methods for treating cancers and/or inducing cell death can be a targeting treatment for certain cancers.