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. Author manuscript; available in PMC: 2016 Mar 1.

Published in final edited form as: Curr Microbiol. 2014 Nov 11;70(3):345–354. doi: 10.1007/s00284-014-0724-3

Table 1.

Physico-chemical properties of compounds 1-4

	1^a)	2^a)	3^a)	4^a)
Molecular Formula	C₁₄H₁₀N₂O₂	C₁₅H₁₂N₂O₄	C₁₉H₁₉N₃O₅S	C₁₆H₁₄N₂O₄
Appearance	Pale-yellow solid, UV-absorbing (254 nm)	Pale-yellow solid, UV-absorbing (254 nm)	Pale-yellow solid, UV-absorbing (254 nm)	Pale-yellow solid, UV-absorbing (254 nm)
HPLC-R _t	12.86 (min)	12.48 (min)	12.37 (min)	20.06 (min)
R _f	0.28 (DCM/10% MeOH)	0.10 (DCM/20% MeOH)	0.34 (DCM/20% MeOH)	0.13 (DCM/20% MeOH)
Anisaldehyde/H₂SO₄ reagent	Yellow	Yellow	Yellow	Yellow
(+)-APCI-MS: m/z	239 [M + H]⁺, 477 [2M + H]⁺, 193 [(M-COOH) + H]⁺	285 [M + H]⁺, 267 [M – H₂O]⁺, 239 [(M-COOH) + H]⁺	402 [M + H]⁺, 273 [(M-Cys) + H]⁺	299 [M + H]⁺, 267 [M – H₂O]⁺, 239 [(M-COOH) + H]⁺
(–)-APCI-MS: m/z	237 [M – H]^–, 475 [2M – H]^–, 191 [(M-COOH) – H]^–	-	400 [M – H]^–, 801 [2M – H]^–, 271 [(M-Cys) – H]^–	-
(+)-HRESI-MS: m/z	239.0814 [M + H]⁺	-	-	-
Calcd.	239.0815 for C₁₄H₁₁N₂O₂ [M + H]⁺	-	-	-
(–)-HRESI-MS: m/z	237.0662 [M – H]^–	-	-	-
Calcd.	237.0669 for C₁₄H₉N₂O₂ [M – H]^–	-	-	-
UV/VIS (MeOH): λ_max (log ε)	394 sh (3.08), 366 sh (3.42), 282 (4.30), 213 (4.17) nm	374, 278, 240, 213 nm	375, 278, 241, 214 nm	374, 272, 240, 218 nm

^a)

For HPLC, UV and Mass spectrometry data, see supporting information Fig. S4-7, S13, S19 and S25.