The search for this exact string doesn't return a direct match for a known viral video, specific song, or piece of digital art. However, based on the syntax, this query could mean a few different things:
If this were a 450MB MP4 file, here is the creative direction I’d take for it: L-R: Left-Right (Binaural/Stereo focus). @f: At Frequency. 3lC: "Electric" or "3rd Level Circuit." L-R@f@3lC-450m3.mp4
You are looking for a specific, possibly obscure, video file that exists under this name in a database or archive. The search for this exact string doesn't return