Fig. 5 | Nature Communications

Fig. 5

From: Understanding hydrogen-bonding structures of molecular crystals via electron and NMR nanocrystallography

Fig. 5

Four possible molecular structures of cimetidine form B. The cimetidine form B (CB) structures of a CB1, b CB2, c CB3, and d CB4 depend on the protonation site of the imidazole ring. The atomic numbering scheme is shown. Each structure is composed of two conformations; I and II refers to an extended and a bent conformation, respectively. The yellow, blue, gray, and white atoms denote sulfur, nitrogen, carbon, and hydrogen atoms, respectively

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