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In general, Lorenzo concludes that Sage performs better than GAFF when all atoms are in a ring (case 1), but underperforms in all other cases (2, 3, 4).

Sage 2.1 separated some ring terms out:

Code Block
-  a18a child parameter to separate out some ring matches from a18  
-  a22a child parameter to separate out some ring matches from a22

Parameter

SMIRKS

Notes

a18

Code Block
"[*:1]~[#7X4,#7X3,#7X2-1:2]~[*:3]"

General N angle

a18a

Code Block
"[*:1]@-[r!r6;#7X4,#7X3,#7X2-1:2]@-[*:3]"

Atom 2 is any N in a ring that is not 6-membered

a22

Code Block
"[*:1]~[#7X2+0:2]~[*:3]"

General neutral N with 2 substituents

a22a

Code Block
"[*:1]~[#7X2+0r5:2]~[*:3]"

Neutral N with 2 substituents in a 5-membered ring