Correction: Nukulkit et al. Eight Indole Alkaloids from the Roots of Maerua siamensis and Their Nitric Oxide Inhibitory Effects. Molecules 2022, 27, 7558
Sasiwimon Nukulkit, Angkana Jantimaporn, Preeyaporn Poldorn, Mattaka Khongkow, Thanyada Rungrotmongkol, Hsun-Shuo Chang, Rutt Suttisri, Chaisak Chansriniyom
Abstract
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Taxonomy
TopicsAlkaloids: synthesis and pharmacology · Natural product bioactivities and synthesis · Morinda citrifolia extract uses
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 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 C_20_H_12_N_3_O_2_) 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^; ^1^H and ^13^C-NMR data (acetone-d6): see Table 4; HR-ESI-MS m/z 326.0968 (calcd. for C_20_H_12_N_3_O_2_, 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.
The reference list from the paper itself. Each links out to its DOI / PubMed record.