. Author manuscript; available in PMC: 2017 Apr 27.

Published in final edited form as: J Am Chem Soc. 2016 Apr 12;138(16):5426–5432. doi: 10.1021/jacs.6b02276

Table 1.

Selected ¹H Chemical Shifts and LC/MS Data for 29b, 5b, 30b, and Precolibactin B (3)^a

position	1	2	3	4	t_r (min)
29b	8.83	3.60	8.94	4.56	3.52
5b	8.78	^b	8.65	^b	3.48
30b	8.46	6.16		5.59, 5.50	3.55
precolibactin B (3)¹¹	8.44	6.16		5.61, 5.48

¹H spectroscopic data recorded in DMSO-d₆ (500 MHz, 23 °C). Complete ¹H NMR spectra (Figure S2) and LC/MS conditions are presented in the Supporting Information.

Not resolved.