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. 2021 Nov 25;25:42. doi: 10.1186/s40824-021-00244-4

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — (A) Chemical structure of gemcitabine monophosphate (dFdCMP) and 5-Fluorouracil monophosphate (5FdUMP), (B) dFdCMP (P19-dFdCMP) and 5FdUMP (P19–5FdUM) conjugated structure with P19 is indicated by a red dot representing dFdCMP and a blue dot representing 5FdUMP, (C) Chemical structure of MMAE (monomethyl auristatin E) conjugated with P19 by Linker and SE (Sticky sequence), (D) Chemical structure of DM1(maytansine 1) conjugated with P19 by linker and SE (Sticky sequence)