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Comparison of the low energy conformations of catechol agonists. DHX (blue) and (A) SKF 38393 (yellow) or (B) apomorphine (pink) were manually aligned with priority for the amino proton that interacts with Asp103. Nonpolar hydrogens have been omitted for clarity. TM5 serines are included to illustrate the proposed interacting partners of the meta-OH and para-OH of the catechol moieties.
