Extended Data Fig. 8: 1H NMR spectra for sequential reactions with the mixture of α-anhydrouridine (15), C (1) and U (2).
From: Selective prebiotic formation of RNA pyrimidine and DNA purine nucleosides
a, 1H NMR spectrum of the mixture after heating with 8-mercaptoadenine (16) and magnesium chloride at 150 °C for 1.5 d. b, As in a, after irradiation with hydrogen sulfide at 254 nm. c, As in a, after reacting with nitrous acid for 2 d; dA (7):dI (9):C (1):U (2) = 14:14:44:28). f1, chemical shift (δ).
