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. Author manuscript; available in PMC: 2019 Dec 11.
Published in final edited form as: Chem Commun (Camb). 2018 Dec 11;54(99):14005–14008. doi: 10.1039/c8cc07432a

Fig. 2.

Fig. 2.

Crystal structures of the spirohexene (top) and azaspirohexene 1f (bottom) viewed from the side and the top. The R or R’ group are omitted for clarity.