Conclusion The significant increase of the thermal, chemical, and photochemical stability of the chromophore in the complexed formw is likely a result of the following interactions:(1) the hydrophobic environment of the epoxide and the unsaturated bonds;(2) steric coverage of the active reaction site ((212) with Phe78 and the methyl group (C6') of the amino sugar moiety;(3) stabilization of a rigid conformation of the chromophore by a network of ...