Assignment of the I3C NMR signals are shown in Scheme 1.''The yield of the photoproduct 2 was 18% on the basis of consumed thymidine. The existence of 2-deoxy-~-ribose in the photolysate was confirmed by means of TLC analysis." Photoexcited thymidine (la) and 1- alkylthymines (lb, c) react with primary alkylamines in a similar fashion to produce N-(1)- substituted thymines (3). For example, irradiation of at
