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. 2019 Jan 10;10:113. doi: 10.1038/s41467-018-07751-4

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — Analysis of a sample with a size range centered around 90 PRUs as the main specie. a ¹H NMR (DMSO-d6); b linear mode MALDI-TOF MS (Cs⁺ cationized); c SEC; and d SEC-MALS analyses of the largest calixarenes isolated (two-step process, 0.8 equivalent of RbOH vs phenol). PRU numbers are shown in boxes. The red and green asterisks are referring to calix[8]arene and giant calixarenes, respectively