What is the chemical name for Tylenol 3?

Depending on which kind of Tylenol it's either Paracetamol or Acetaminophen

Well... Tylenol 3is a compound medication that consists of 30mg of codeine and 300mg of acetaminophen (paracetamol). The active substance of Tylenol is N-acetyl-para-aminophenol, APAP. In the US it is generally known as Acetaminophen. In Europe the medication is mainly known as Paracetamol.