https://docs.chemaxon.com/display/docs/Extended+Connectivity+Fingerprint+ECFP
https://www.rdkit.org/docs/GettingStartedInPython.html#morgan-fingerprints-circular-fingerprints
Morgan fingerprint(Circular Fingerprints): Fingerprints based on the Morgan algorithm, similar to the ECFP/FCFP fingerprints; J. Chem. Inf. and Model. 50:742-54 (2010).