TABLE 3

¹³C NMR chemical shift assignments for MRX-I, MRX445-1, MRX445-2, and MRX413

NMR spectra shown in Supplemental Figs. 2 –5.

Carbon	Chemical Shift for
Carbon	MRX-I	MRX445-1	MRX445-2	MRX413
	ppm
1	102.5, d	59.8, t	37.8, t	101.4, d
2	152.5, d	55.4, t	173.5, s	153.5, d
3	49.6, t	49.3, t	43.1, t	49.2, t
4	36.5, t	33.6, t	42.3, t	35.4, t
5	191.1, s	173.4, s	65.7, d	193.6, s
6	145.5–148.0, d	147.1–149.1, d	146.2–148.0, d
7	141.2–143.6, d	141.9–143.9, d	139.8–141.7, d
8	125.5, s	126.8, s	127.2, s	125.1, s
9	108.5, d	108.6, d	109.5, d	108.1, d
10	151.3–153.7, d	153.3–155.2, d	153.3–155.1, d
11	121.8, s	121.9, s	113.5, s	121.5, s
12	154.9, s	155.2, s	155.7, s	154.9, s
13	73.3, d	73.0, d	72.8, d	72.2, d
14	49.3, t	49.1, t	49.7, t	48.6, t
15	46.4, t	46.3, t	46.5, t	48.5, t
16	164.3, s	164.2, s	164.2, s	168.1, s
17	96.9, d	96.9, d	97.0, d	35.9, t
18	159.0, d	159.0, d	159.1, d	58.2, t

d, CH or CF; q, CH₃; s, C; t, CH₂.