My problem with that is if they can only learn whats on a the Alchemist formula list, then why add this section in the extracts description of the alchemist.
"Extracts cannot be made from spells that have focus requirements (alchemist extracts that duplicate divine spells never have a divine focus requirement)."
It seems to me they are giving you leeway to go beyond that list as long as you meet the criteria of the spell not having a focus requirement. Otherwise they would have just said you can cast whats on this list.
Just my opinion though. :)