The Department of Commerce, specifically the United States Patent and Trademark Office (USPTO), is seeking to modify an existing contract (DOC52PAPT1500018) to extend access to the Chemical Abstract Service (CAS) collection of patent and non-patent literature for an additional six months. This modification aims to incorporate tailored Department of Commerce FAR 52.217-8 Option to Extend Services and secure pricing for the extension, with an estimated value of $10,875,980.50. The CAS collection is crucial for the USPTO's operations, providing essential information across multiple platforms, including the Scientific and Technical Network (STN) and SciFinder. Interested parties should note that this procurement is being conducted under the Alternative Competition Method due to the unique qualifications of CAS, and this notice does not constitute a request for competitive proposals.