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Figure 7
Full interaction maps shown around one of the molecules of L-pyroglutamic acid in (a) the (stable) α form (CSD refcode LPYGLU07, Z′ = 3) and (b) the (metastable) β form of the compound (CSD refcode LPYGLU08, Z′ = 1) (Panda et al., 2015BB35). The circled oxygen acceptor in the interaction map diagram shown for the β form (b) is observed outside of any preferred acceptor region of the maps (red contours), indicating that this hydrogen-bonding interaction has a sub-optimal geometry.

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