Could someone help me identify this bluish compound?

Apparently it is a selective extraction of three compounds, acetaminophen, acetylsalicylic acid and caffeine. Dichloromethane was added to separate the caffeine and subsequently NaOH. When NaOH was added, this bluish precipitate formed. My theory is the formation of a complex of sodium and acetaminophen due to the presence of electron pairs in the molecule.