Some RxNorm record labels have "(USP)" at the end

[jsstevenson]

https://qualitymatters.usp.org/what-letters-usp-mean-label-your-medicine

This is probably not in the spirit of what we're going for regarding "labels" (more akin to the physical labeling, not the 'primary name' for the drug). Possibly -- strip the tag from the end, and include the full tagged string as an alias.