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Optimized geometrical configurations of HBT-Enol1 in the ground and excited states, HBT-Enol2 in the ground state and HBT-Keto in the excited state. (a) HBT-Enol1(S0), (b) HBT-Enol1(S1), (c) HBT-Enol2(S0), (d) HBT-Keto(S1). Atoms with colors are C (gray), H (white), O (red), N (blue) and S (yellow).
