Correction: Nukulkit et al. Eight Indole Alkaloids from the Roots of Maerua siamensis and Their Nitric Oxide Inhibitory Effects. Molecules 2022, 27, 7558

Error in Table

After a proofreading check, some experimental data were inconsistent with the supplementary information in the original publication [1]. Firstly, the carbon at position 9 of maeruabisindole C (compound 8) was a quaternary carbon, as evidenced by Figures S90 and S91 (the HSQC and HMBC spectra, respectively, of compound 8). Thus, the δ_H regarding position 9 in

Table 4. ¹H- and ¹³C-NMR data for compound 8.

8
Position	δH, Multiplicity (J in Hz) a	δC	Position	δH, Multiplicity (J in Hz) a	δC
1		157.1	9		158.8
2	6.80, d (8.0)	101.5	10	7.02, d (2.4)	97.5
3	7.40, t (8.0)	128.2	10a		144.6
4	7.24, d (8.0)	105.1	NH-11	10.39, br s
4a		143.4	11a		135.8
NH-5	10.86, br s		12	8.53, s	110.2
5a		138.0	12a		122.0
6		82.5	12b		113.0
6a		123.0	1-OCH3	4.12, s	56.0
6b		115.4	6-CN		118.3
7	8.33, d (8.8)	122.6	9-OH	8.70, br s
8	6.86, dd (8.8, 2.4)	110.0

^{a 1}H- (400 MHz) and ¹³C-NMR (100 MHz) in acetone-d₆; ppm.

should be deleted. The correct version of Table 4 is given below.

Text Correction

Secondly, in Section 3.3, the IR absorption peaks should be corrected to 3359, 3192, 2921, 2851, 2212, 1658, 1632, 1468, 1412, 1279, 1135, 702, and 632 cm⁻¹, consistent with the IR spectrum of compound 8 (Figure S85), and the theoretical m/z of [M-H]⁻ ion of compound 8 (calcd. for C₂₀H₁₂N₃O₂) should be corrected to 326.0935.

Compound 8 (maeruabisindole C): dark green amorphous; UV λ_max (MeOH) nm (log ε): 210 (4.07), 285(2.93), 355(2.21), 365(2.36); IR (ATR) ν_max: 3359, 3192, 2921, 2851, 2212, 1658, 1632, 1468, 1412, 1279, 1135, 702, 632 cm⁻¹; ¹H and ¹³C-NMR data (acetone-d₆): see Table 4; HR-ESI-MS m/z 326.0968 (calcd. for C₂₀H₁₂N₃O₂, 326.0935).

The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.