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. Author manuscript; available in PMC: 2015 Feb 11.
Published in final edited form as: Chem Commun (Camb). 2014 Mar 11;50(20):2673–2675. doi: 10.1039/c3cc49068h

Fig. 1.

Fig. 1

(A) Structures of 1–4 and their site-specific incorporation into sfGFP at its S2 position. (B) Deconvoluted ESI-MS spectra of sfGFP variants incorporated with 1–4. Their theoretical values are 27 832 Da for 1, 27873 Da for 2, 27886 Da for 3, and 27856 Da for 4. Satellite signals are largely due to metal ion adducts (i.e. Li, Na, K).