An anonymous user commented as follows on the main article page:

(*edited note: agent is in Edgewater Drains I, get there through Edgewater Drains II)

For the Superb Noxious Potion you will need to buy it or have someone make it for you. I just had my Alchy make 10 of them, tossed them into the shared bank and collected them with my Inq. I didn't get the update. I had to buy 1 off of the broker to get update.