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Figure 2 . A packing diagram, with extracellular molecules, showing the four catemers created by acid-to-ketone H bonds proceeding along chains of translationally related molecules, advancing alternately along the 110 and the −110 directions. These chains have alignment with respect to the c axis of + + - -. All non-carboxyl H atoms have been removed for clarity. Displacement ellipsoids are set at the 30% probability level. |