From: A comparative study of SMILES-based compound similarity functions for drug-target interaction prediction
LINGO Dictionary
IDF (log10(N/df))
OC(O
log10(445/2)
C(O)
log10(445/113)
(O) =
log10(445/105)
O) =O
log10(445/143)
CCCC
log10(445/61)
CCC(
log10(445/49)
CC(O
log10(445/36)
O) =C
log10(445/4)
) =C0
log10(445/5)