Your studies into how all things are interconnected have taught you to cast a very limited number of spells.
Benefit(s) Select a single spell from the sorcerer/wizard spell list that is at least 2 levels lower than your highest-level extract known. You can prepare and cast this spell as an arcane spell. Preparing the spell uses up an extract slot 1 level higher than the spell’s level. Your caster level is equal to your alchemist level, and your save DCs and concentration checks are Intelligence-based. You’re considered to have this spell on your spell list for purposes of prerequisites, spell completion items, and spell trigger items.
Pathfinder Player Companion: Cohorts and Companions © 2015, Paizo Inc.; Authors: Brian Duckwitz, Philip Minchin, and Jason Nelson.