\documentclass[a4paper, 11pt]{letter} \usepackage[left=25mm, right=25mm, top=25mm, bottom=25mm]{geometry} \usepackage{setspace} \usepackage{amsmath} \usepackage[version=4]{mhchem} \usepackage{siunitx} \usepackage{bm} \pagestyle{empty} \begin{document} \input{../macro} % Editor-in-Chief Prof. Dr. Stefanie Dehnen\\ \JOURNAL\\ American Chemical Society \vspace{3em} Dear Editor, On behalf of my coauthors, I am pleased to submit our manuscript entitled ``{\TITLE}'' for consideration for publication in {\JOURNAL}. In this work, ... This manuscript has not been published previously and is not under consideration for publication elsewhere. All authors have approved its submission to {\JOURNAL}. The authors declare no competing financial interest. Thank you for considering our manuscript. Sincerely, \vspace{3em} Takahiro Ohkubo\\ Associate Professor\\ Chiba University\\ ohkubo.takahiro@faculty.chiba-u.jp \end{document}