© 2012 John Wiley & Sons, Ltd. This is the pre-peer reviewed version of the following article: Unequivocal 13C NMR assignment of cyclohexadienyl rings in bromotyrosine-derived metabolites from marine sponges, Magnetic Resonance in Chemistry, Vol. 50(11), 2012, pp. 749-754, which has been published in final form at dx.doi.org/10.1002/mrc.3868.