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• W2042372859 abstract "Crystal engineering of the anti-HIV drug lamivudine has currently provided improvement in its pharmaceutical performance besides getting insights into several branches of nucleoside structural chemistry. Here, we demonstrated the synthon robustness and the role of the five-membered ring conformation in the diversity of lamivudine crystal forms even with supramolecular isomerism. Oxathiolane conformation defines the ability of lamivudine to assemble into different multicomponent molecular crystal forms. This was observed in a polymorph of lamivudine hydrochloride, which is related to the previously reported lamivudine hydrochloride monohydrate. The absence of water molecules has little effect on their supramolecular organization. If water is not present, just one conformational change from C3′-endo puckering in the monohydrate form to the C2′-endo one in the anhydrate form reported here is enough to cause a hydrogen bonding reorganization involving the 5′-OH group. DFT calculations reveal a low energy gap for this change in the oxathiolane conformation. Therefore, lamivudine can variably forward its 5′-OH group through changing oxathiolane conformations of similar energies. In addition, the isostructurality and robustness of the supramolecular synthons were illustrated in two halide salts of lamivudine with hydrobromic and hydrofluoric acids. While the previously reported lamivudine hydrochloride is strictly isostructural to the hydrobromide salt, the lamivudine hydrofluoride crystallized as a hydrofluoric acid cocrystal. HF cocrystallization appears to be primarily related to further stabilization between sheets rather than a major size effect." @default.
• W2042372859 created "2016-06-24" @default.
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• W2042372859 date "2015-01-01" @default.
• W2042372859 modified "2023-09-25" @default.
• W2042372859 title "Isostructurality and the conformational role of the 2′,3′-moieties in the diversity of lamivudine crystal forms probed in halide salts" @default.
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• W2042372859 doi "https://doi.org/10.1039/c4ce02373k" @default.
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