diff --git a/free-science-books.md b/free-science-books.md
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+++ b/free-science-books.md
@@ -140,6 +140,7 @@
 * [From Vitamins to Baked Goods: Real Applications of Organic Chemistry (2012)](https://unglue.it/work/145870/) - Kieran Gallagher and Lizhi Fan
 * [Green Chemistry](https://unglue.it/work/488195/) - Mazaahir Kidwai, Neeraj Kumar Mishra
 * [Introduction to Chemistry](https://unglue.it/download_ebook/54777/) - Tracy Poulsen (PDF)
+* [Structural Biochemistry](https://en.wikibooks.org/wiki/Structural_Biochemistry) - Wikibooks
 * [The Story of Alchemy and the Beginnings of Chemistry (1902)](https://www.gutenberg.org/ebooks/14218) - M. M. Pattison Muir