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. 2021 Feb 19;26(4):1109. doi: 10.3390/molecules26041109

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© 2021 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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Chemical structures of (1) vincristine, (2) vinblastine, (3) vindesine, (4) vinorelbine, (5) vinflunine, (6) podophyllotoxin, (7) etoposide and (8) teniposide.