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Superposition of ertapenem–GES-2 with apo-GES-2. The active site of GES-2 is shown (green) centered on the deacylating water (W2, red sphere). The locations of three water molecules in the apo-GES-2 structure are represented as cyan spheres. The W1 water represents the acylating water molecule which is ejected from the oxyanion hole upon ertapenem binding.
