Figure 1

Two different conformers of the S-enantiomer of DHPA.
(a) Conf1. (b) Conf2. Conf2, which DFT found to be 217 meV more stable than Conf1, has an internal hydrogen bond which connects the OH group of C2’ to the N3 atom of the adenine moiety.

Two different conformers of the S-enantiomer of DHPA.
(a) Conf1. (b) Conf2. Conf2, which DFT found to be 217 meV more stable than Conf1, has an internal hydrogen bond which connects the OH group of C2’ to the N3 atom of the adenine moiety.