Always prioritize legal and safe methods to obtain study materials. If you have access to the physical book or can purchase an e-book, those are the best options to ensure you're getting a legitimate copy.
You are looking for a verified PDF of "Organic Chemistry" by Jonathan Clayden, Stuart Warren, and Nick Greeves, but it seems there might have been a mix-up with the author's name. The correct authors for the well-known organic chemistry textbook are indeed Clayden, Warren, and Greeves, not McMurry. However, John McMurry is another prominent author of an organic chemistry textbook.