Alchemy on Terramar
Terramar has chemistry equal to TL 5 (and medicine and physics equal to TL 6).
It also has alchemy.
Rules for Alchemy are found in GURPS Magic Chapter 28, pp. 210-222. On Terramar, potions (“elixirs”) cost differently, because they cost $50 per day to make, plus the cost of materials. For example, an Elixir of Healing costs $50+(7
Alchemy rules are also found in GURPS Thaumatology pp. 100-107.
Also in Alchemical Baroque, pp. 12-13.
And Ritual Path Magic pp. 28-30.