DL-homocysteic acid, a model for monomolecular bile acids in solution: Fourier transform infrared studies: J-B Hui, Z-Y Xu, [formula omitted], J. Bian, J-G Wu, Z-H Xu, G-X Xu. Institute of Chemistry and Molecular Engineering, Peking University, Beijing, China and Gastrointestinal Division, University of Texas Medical Branch, Galveston, TX