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. 2020 May 28;10(6):221. doi: 10.3390/metabo10060221

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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MS² spectrum of ulbactin B ([M+H]⁺: C₁₇H₂₁N₂O₃S₂⁺, calculated: m/z 365.0988, measured: m/z 365.0991, Δm −0.8 ppm). It shows an NL of 153 (fragment a), 119 (fragment b), 165 (fragment c), 175 (fragment d), and 183 Da (fragment e), which correspond to the proposed fragments.