ISIS keys

https://doi.org/10.1351/goldbook.11457

Predefined fragment keys that are used in 2D substructure and similarity searching with the ISIS software but are also generated by many other software programs and used for 2D-QSAR or cluster analysis of molecules.

Source:
PAC, 2016, 88, 239. (Glossary of terms used in computational drug design, part II (IUPAC Recommendations 2015)) on page 248 [Terms] [Paper]