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. 2018 Jul 4;11(3):65. doi: 10.3390/ph11030065

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© 2018 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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Scheme 1 — Schematic depiction of the syntheses of the GRPR- and NPY(Y₁)R-affine HBPLs 22−26 and the scrambled analogs 24a–c. Conditions: (A) 1, H₂O + 0.1% TFA, phosphate buffer, pH 4.0−4.6, RT, 5 min, yields: 47% for 17, 51% for 18, 43% for 19, 44% for 19a, 58% for 20, 55% for 21; (B) 2, H₂O + 0.1% TFA, phosphate buffer, pH 4.0−4.6, RT, 5 min, yields: 82% for 22, 79% for 23, 66% for 24, 49% for 24a, 63% for 24b, 61% for 24c, 75% for 25, 73% for 26.