The author doesn't seem to make the connection, but the Mallinckrodt Corporation's cocaine hydrochloride can also be found at your favorite neighborhood retailers as a white powder for ~$80 / gram. It's 'regular' cocaine.
https://en.wikipedia.org/wiki/Cutting_agent
And more specifically, Levamisole is becoming something of a hot topic as a dangerous, but desirable for its ability to pass most purity tests. http://www.time.com/time/health/article/0,8599,1955112,00.ht... is one overview. The DEA journal Microgram has covered it a few times as well.