functional class fingerprints

initialism: FCFP

https://doi.org/10.1351/goldbook.11449

Hashed circular fingerprints that encode each atom according to its property (hydrophobic, hydrogen bond donor, hydrogen bond acceptor, negatively charged, or positively charged) for path length 2, FCFP2; path length 4, FCFP4; and path length 6, FCFP6.

Source:
PAC, 2016, 88, 239. 'Glossary of terms used in computational drug design, part II (IUPAC Recommendations 2015)' on page 247 (https://doi.org/10.1515/pac-2012-1204)