Used in cancer research to block the farnesylation of proteins, particularly Ras proteins involved in cell signaling pathways. By inhibiting farnesyltransferase (FTase), this compound prevents the attachment of farnesyl groups to proteins, which is essential for their proper localization and function. Since mutated Ras proteins are found in many tumors, FTase Inhibitor I helps study the disruption of oncogenic signaling, making it a valuable tool in developing targeted cancer therapies. It is also used to investigate post-translational modifications and their impact on cell proliferation and apoptosis.