We, the authors, would like to express our gratitude to the financial supporting of the Fund of Northwest A & F University, National Natural Science Foundation of China (Grant No. 31170796 and 81373892) and New Century Excellent Talents in University of Ministry of Education of China.

    We would like to appreciate Zhang Yuanbing, Dai Shengfei and Cao Yuedi, 3 undergratuate students in Northwest A & F University, who helped us build the dataset. Cordial thanks are also given to the authors of PubChem, ChemSpider database, and Open Babel software, as well the scientists who explored and are exploring natural products for their helpful work.

    Finally, we would like to give heartfelt thanks to the contributors listed below who submitted their data to CancerHSP. Without their selfless, complete and never-ending support, this database would never maintain comprehensive and up to date.