7-Chloro-8-trifluoromethylisoalloxazines with D-ribityl, D-galactyl, D-sorbityl, and L-rhamnityl substituants in the 10 position were obtained. The effect of the trifluoromethyl group on the electronic spectra of flavins containing a trifluoromethyl group was studied.
Communication IX from the series 
Investigation of a Number of Riboflavin Analogs
, see [1] for communication VIII. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1686–1689, December, 1976.