How does varying chemical structure influences quantum coherence loss? To address this question, we reconstructed the spectral densities of thymine (T), its nucleoside (T + sugar (S)) and nucleotide (T + S + phosphate (P)) in water at 298 K from RR data in Refs. . Figure details the overall decoherence and the contributions of intramolecular vibrations and solvent to the decoherence in this series, and Fig. their chemical structure. The reconstructed J(ω) for thymine and its nucleoside, as well as all the needed parameters, are included in Fig. and Table -S3 of the supplementary information, respectively.