Classification of Organic Molecules by Molecular Quantum Numbers

Classifying organic molecules using counts for simple structural features, such as atom, bond and ring types, called molecular quantum numbers (MQNs), defines a universal chemical space for analyzing large molecular databases such as ZINC and GDB. The organization of MQN space is revealed by principal component analysis (PCA), as shown for the GDB-11 database (26.4 million structures, up to 11 atoms of C, N, O, F). Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.