-dbsearch True
-dbcatoms 1 # index of connecting atom in SMARTS query, see below
-dbbase chembl_21 # name of your database file without the file extension
-dbfname simres.smi # results file name, default is simres.smi
-dbatoms <15 # atom filter
-dbsmarts [#7D1,#7D2;!+]
-dballowedels H,C,N,F,Cl,Br,I # allowed element filter
-dbmaxsmartsmatches 1 # max. SMARTS matches filter