+Infrared identification of indole ring in indoles and indole alkaloids in the 700 to 400 cm.−1 region Authors: R. J. Warren, I. B. Eisdorfer, W. E. Thompson, J. E. ZaremboPublished: Journal of Pharmaceutical SciencesDate: December 1965Category:Chemistry, Analysis, Structure determinationTags:infrared identificationComments:0