為何acetaminophen( paracetamol, 醋氨酚)是微酸性?

the answer is phenol group....
phenol group (Ph-OH)is acidic because of delocalized Pi orbital of beneze ring, it's a simple question if you are F.7 student, work harder on chemistry ar (although it's biochemistry topic at University level)

acetaminophen have amind group, the amide group can decompoes to carboxylic acid and amine, so it is slightly acidic