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Structural requirements for GlcN6P derivatives acting as activators of the glmS riboswitch. Red: The cyclic structure and the equatorial substituents in the 2‐ and 4‐positions are essential. Green: Variation of the ring oxygen is tolerated. 1: Unsubstituted carba‐GlcN6P with similar activity to GlcN6P. 2, 3: Substituted carba‐GlcN6P derivatives (c.f. text).
