ChEBI: Trans-3-hydroxycotinine is an N-alkylpyrrolidine that is cotinine substituted at position C-3 by a hydroxy group (the 3R,5S-diastereomer). It is a N-alkylpyrrolidine, a member of pyridines, a pyrrolidine alkaloid and a member of pyrrolidin-2-ones. It is functionally related to a (-)-cotinine.