Chemical features
- Feature
- chemical
- structural
- substructural
- graph
- tree
- path
- tree
- graph
- pharmacophoric
- graph theoretic
- substructural
- physico-chemical
- topological
- quantum-chemical
- similarity
- other
- structural
- biological
- toxicological
- other
- structural alert
- chemical
Blue Obelisk descriptors ontology
http://qsar.sourceforge.net/dicts/qsar-descriptors/index.xhtml