One is not enough: Terminal alkenes are used as chemical reporters and ligation partners for 1,2,4,5-tetrazines in a Diels–Alder reaction with inverse electron demand (DARinv). Combination with strain-promoted azide–alkyne cycloaddition (SPAAC) allows the visualization of two different glycan structures in one experiment.
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Niederwieser et al. (2013) studied this question.
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