/usr/share/openbabel/2.3.2/gaff.prm is in libopenbabel4v5 2.3.2+dfsg-3build1.
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The actual contents of the file can be viewed below.
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// Copyright (C) 2009 by Frank Peters <e.a.j.f.peters@tue.nl>
//
// This is a SMARTS template-file for GAFF-atom types
//
// It is attempted to obey the typing given in the "ATOMTYPE_GFF.DEF"
// file included with the antechamber package of amber10.
// There is no 1-to-1 correspondence between the ATD format and SMARTS.
// Therefore the current definitions need to be tested and possibly changed
//
//
//
// GAFF atomtypes defined using SMARTS
// [SMARTS] [atomtype id number] [description]
// must be sorted according to the ELEMENT and COMPLEXITY OF THE TYPERULE!
//
// Be careful lines do not exceed the maximum length of 80!
atom [*] X
atom [#1X1] ha "other hydrogen e.g. on aromatic C"
atom [#1X1][CX4] hc "hydrogen on aliphatic C"
// "hydrogen on aliphatic C with 1 ewd"
atom [#1X1][CX4][#7,#8,#16,#17,#35,#53] h1
// "hydrogen on aliphatic C with 2 ewd"
atom [#1X1][CX4]([#7,#8,#16,#17,#35,#53])[#7,#8,#16,#17,#35,#53] h2
// "hydrogen on aliphatic C with 3 ewd"
atom [#1X1][CX4]([#7,#8,#16,#17,#35,#53])([#7,#8,#16,#17,#35,#53])[#7,#8] h3
atom [#1X1][CX4]([#7,#8,#16,#17,#35,#53])([#7,#8,#16,#17,#35,#53])[#16,#17] h3
atom [#1X1][CX4]([#7,#8,#16,#17,#35,#53])([#7,#8,#16,#17,#35,#53])[#35,#53] h3
// "hydrogen on sp2 C with 1 ewd"
atom [#1X1][#6X3][#7,#8,#16,#17,#35,#53] h4
// "hydrogen on sp2 C with 2 ewd"
atom [#1X1][#6X3]([#7,#8,#16,#17,#35,#53])[#7,#8,#16,#17,#35,#53] h5
atom [#1X1][#6](N)(N)(N)N hx ""
atom [#1X1]O ho "hydrogen on oxygen"
atom [#1X1][Oh1] hw "hydrogen on water"
atom [#1X1]N hn "nitrogen"
atom [#1X1]S hs "sulphur"
atom [#1X1]P hp "phosphor"
atom [#6X4] c3 "other sp3 C"
atom [#6X4r3] cx "3-membered ring atom"
atom [#6X4r4] cy "4-membered ring atom"
atom [#6X3] c2 "other sp2 C"
atom [#6X3](N)(N)N cz "guanidine carbon"
atom [#6X3;R](=*)-*=* cc "inner sp2 C of conjugated ring systems"
atom [#6X3;R](=*)-*#* cc "inner sp2 C of conjugated ring systems"
atom [#6X3;R](#*)-*#* cc "inner sp2 C of conjugated ring systems"
atom [#6X3;!R](=*)-*=* ce "inner sp2 C of conjugated chain systems"
atom [#6X3;!R](#*)-*=* ce "inner sp2 C of conjugated chain systems"
atom [#6X3;!R](#*)-*#* ce "inner sp2 C of conjugated chain systems"
atom [cr6](c)(c)c cp "bridge aromatic c in byphenyl system"
atom [#6X3r3] cu "sp2 carbon in a 3-membered ring"
atom [#6X3r4] cv "sp2 carbon in a 4-membered ring"
atom [#6X3]=[O,S] c "C=O or C=S"
atom [c] ca "pure aromatic atom"
atom [#6X2] c1 "other sp C"
atom [#6X2](=*)-*=* cg "sp C of conjugated system"
atom [#6X2](#*)-*=* cg "sp C of conjugated system"
atom [#6X2](#*)-*#* cg "sp C of conjugated system"
atom [#6X1] c1 "other sp C"
atom [F]* f (-*) "general fluorine"
atom [Cl]* cl (-*) "general chlorine"
atom [Br]* br (-*) "general bromine"
atom [I]* i (-*) "general iodine"
atom [#15X1] p2 "other sp2 P"
atom [#15X2] p2 "other sp2 P"
atom [#15X2;R](=*)-*=* pc "inner sp2 P of conjugated ring systems"
atom [#15X2;R](=*)-*#* pc "inner sp2 P of conjugated ring systems"
atom [#15X2;R](#*)-*#* pc "inner sp2 P of conjugated ring systems"
atom [#15X2;!R](=*)-*=* pe "inner sp2 P of conjugated chain system"
atom [#15X2;!R](=*)-*#* pe "inner sp2 P of conjugated chain system"
atom [#15X2;!R](#*)-*#* pe "inner sp2 P of conjugated chain system"
atom [#15;a] pb "aromatic P"
atom [#15X3] p3 "other sp3 P"
atom [#15X3](=*)-*=* px "sp2 P of conjugated system"
atom [#15X3](=*)-*#* px "sp2 P of conjugated system"
atom [#15X3]=[O,S] p4 "hypervalent P"
atom [#15X4] p5 "hypervalent P"
atom [#15X4](=*)-*=* py "P of conjugated system"
atom [#15X4](=*)-*#* py "P of conjugated system"
atom [#15X5] p5 "hypervalent P"
atom [#15X6] p5 "hypervalent P"
atom [#7X1] n1 "sp1 N"
atom [#7X2] n2 "sp2 N"
atom [#7X2](=*)=* n1 "sp1 N"
atom [#7X2](-*)#* n1 "sp1 N"
atom [#7X2;R](=*)-*=* nc "inner sp2 N of conjugated ring systems"
atom [#7X2;R](=*)-*#* nc "inner sp2 N of conjugated ring systems"
atom [#7X2;R](#*)-*#* nc "inner sp2 N of conjugated ring systems"
atom [#7X2;!R](=*)-*=* ne "inner sp2 N of conjugated chain system"
atom [#7X2;!R](=*)-*#* ne "inner sp2 N of conjugated chain system"
atom [#7X2;!R](#*)-*#* ne "inner sp2 N of conjugated chain system"
atom [nX2] nb "aromatic N"
atom [#7X3] n3 "sp3 N"
atom [#7X3]a nh "amine N connected to aromatic ring"
atom [#7X3]=[CX3] nh ""
atom [#7X3]=[N2] nh ""
atom [#7X3]=[P2] nh ""
atom [#7X3]-[CX3]=[O,S] n "sp2 N in amides"
atom [#7X3](O)O no "N in nitro group"
atom [nX3] na "aromatic N"
atom [#7X4] n4 "sp3 N"
atom [OX1] o "sp2 O"
atom [OX2] os "sp3 O in esters and ethers"
atom [OX3] os "sp3 O in esters and ethers"
atom [OX2H] oh "sp3 O in hydroxyl group"
atom [OX3H] oh "sp3 O in hydroxyl group"
atom [SX1] s ""
atom [SX2] ss "sp3 sulphur"
atom [SX2]=* s2 "sp2 sulphur"
atom [SX2]#* s2 "sp2 sulphur"
atom [SX2H] sh "sp3 S in thiol"
atom [SX3] s4 "hypervalent S"
atom [SX3](=*)-*=* sx "conjugated S"
atom [SX3](=*)-*#* sx "conjugated S"
atom [SX4] s6 "hypervalent S"
atom [SX4](=*)-*=* sy "conjugated S"
atom [SX4](=*)-*#* sy "conjugated S"
atom [SX5] s6 "hypervalent S"
atom [SX6] s6 "hypervalent S"
atom [He] He ""
atom [Li] Li ""
atom [Be] Be ""
atom [B] B ""
atom [Ne] Ne ""
atom [Na] Na ""
atom [Mg] Mg ""
atom [Al] Al ""
atom [Si] Si ""
atom [Ar] Ar ""
atom [K] K ""
atom [Ca] Ca ""
atom [Sc] Sc ""
atom [Ti] Ti ""
atom [V] V ""
atom [Cr] Cr ""
atom [Mn] Mn ""
atom [Fe] Fe ""
atom [Co] Co ""
atom [Ni] Ni ""
atom [Cu] Cu ""
atom [Zn] Zn ""
atom [Ga] Ga ""
atom [Ge] Ge ""
atom [As] As ""
atom [Se] Se ""
atom [Kr] Kr ""
atom [Rb] Rb ""
atom [Sr] Sr ""
atom [Y] Y ""
atom [Zr] Zr ""
atom [Nb] Nb ""
atom [Mo] Mo ""
atom [Tc] Tc ""
atom [Ru] Ru ""
atom [Rh] Rh ""
atom [Pd] Pd ""
atom [Ag] Ag ""
atom [Cd] Cd ""
atom [In] In ""
atom [Sn] Sn ""
atom [Sb] Sb ""
atom [Te] Te ""
atom [Xe] Xe ""
atom [Cs] Cs ""
atom [Ba] Ba ""
atom [La] La ""
atom [Ce] Ce ""
atom [Pr] Pr ""
atom [Nd] Nd ""
atom [Pm] Pm ""
atom [Sm] Sm ""
atom [Eu] Eu ""
atom [Gd] Gd ""
atom [Tb] Tb ""
atom [Dy] Dy ""
atom [Ho] Ho ""
atom [Er] Er ""
atom [Tm] Tm ""
atom [Yb] Yb ""
atom [Lu] Lu ""
atom [Hf] Hf ""
atom [Ta] Ta ""
atom [W] W ""
atom [Re] Re ""
atom [Os] Os ""
atom [Ir] Ir ""
atom [Pt] Pt ""
atom [Au] Au ""
atom [Hg] Hg ""
atom [Tl] Tl ""
atom [Pb] Pb ""
atom [Bi] Bi ""
atom [Po] Po ""
atom [At] At ""
atom [Rn] Rn ""
atom [Fr] Fr ""
atom [Ra] Ra ""
atom [Ac] Ac ""
atom [Th] Th ""
atom [Pa] Pa ""
atom [U] U ""
atom [Np] Np ""
atom [Pu] Pu ""
atom [Am] Am ""
atom [Cm] Cm ""
atom [Bk] Bk ""
atom [Cf] Cf ""
atom [Es] Es ""
atom [Fm] Fm ""
atom [Md] Md ""
atom [No] No ""
atom [Lr] Lr ""
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