This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/mrc.4936 This article is protected by copyright. All rights reserved. Franco Pedro (Orcid ID: 0000-0002-3148-2319) Purity determination of a new antifungal drug candidate using quantitative 1 H NMR spectroscopy: method validation and comparison of calibration approaches Pedro Henrique Cavalcanti Franco a* ; Saulo Fehelberg Pinto Braga b ; Renata Barbosa de Oliveira a ; Isabela Costa César a a Departamento de Produtos Farmacêuticos, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil b Departamento de Farmácia, Escola de Farmácia, Universidade Federal de Ouro Preto, Ouro Preto, Brasil * Corresponding author. e-mail: pedrofrancobh@gmail.com Tel: +55 31 3409 6982 Postal address: Departamento de Produtos Farmacêuticos, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, 31270-901, Belo Horizonte, MG, Brazil. The authors declare that there are no conflicts of interest involved in the publication of this article.