diff --git a/links_and_mods.cif b/links_and_mods.cif
index acc70d6b6..ea3e1a7f2 100644
--- a/links_and_mods.cif
+++ b/links_and_mods.cif
@@ -11,7 +11,6 @@ _chem_link.name
 DG9-SER DG9 DG9m1 NON-POLYMER SER SERm1 peptide DG9-SER
 DNA-SER . DEL_OP3 DNA/RNA SER SERm1 peptide DNA-SER
 DNA-TYR . DEL_OP3 DNA/RNA TYR TYRmod5 peptide DNA-TYR
-SS . CYS-SS peptide . CYS-SS peptide SS-bridge
 disulf CYS CYS-SS peptide CYS CYS-SS peptide SS-bridge
 CYS-MPR CYS CYS-SS peptide MPR MPRm1 NON-POLYMER SS-bridge
 TRANS . DEL-OXT peptide . DEL-HN1 peptide TRANS
@@ -427,47 +426,6 @@ _chem_link_chir.atom_id_3
 _chem_link_chir.volume_sign
 DNA-TYR 1 P 1 "O5'" 2 OH 1 OP2 both
 
-data_link_SS
-loop_
-_chem_link_bond.link_id
-_chem_link_bond.atom_1_comp_id
-_chem_link_bond.atom_id_1
-_chem_link_bond.atom_2_comp_id
-_chem_link_bond.atom_id_2
-_chem_link_bond.type
-_chem_link_bond.value_dist
-_chem_link_bond.value_dist_esd
-SS 1 SG 2 SG single 2.031 .020
-
-loop_
-_chem_link_angle.link_id
-_chem_link_angle.atom_1_comp_id
-_chem_link_angle.atom_id_1
-_chem_link_angle.atom_2_comp_id
-_chem_link_angle.atom_id_2
-_chem_link_angle.atom_3_comp_id
-_chem_link_angle.atom_id_3
-_chem_link_angle.value_angle
-_chem_link_angle.value_angle_esd
-SS 1 CB 1 SG 2 SG 103.800 1.800
-SS 1 SG 2 SG 2 CB 103.800 1.800
-
-loop_
-_chem_link_tor.link_id
-_chem_link_tor.id
-_chem_link_tor.atom_1_comp_id
-_chem_link_tor.atom_id_1
-_chem_link_tor.atom_2_comp_id
-_chem_link_tor.atom_id_2
-_chem_link_tor.atom_3_comp_id
-_chem_link_tor.atom_id_3
-_chem_link_tor.atom_4_comp_id
-_chem_link_tor.atom_id_4
-_chem_link_tor.value_angle
-_chem_link_tor.value_angle_esd
-_chem_link_tor.period
-SS ss 1 CB 1 SG 2 SG 2 CB 90.00 10.0 2
-
 data_link_disulf
 loop_
 _chem_link_bond.link_id
diff --git a/list/mon_lib_list.cif b/list/mon_lib_list.cif
index f61a649fc..a27510022 100644
--- a/list/mon_lib_list.cif
+++ b/list/mon_lib_list.cif
@@ -36352,7 +36352,6 @@ _chem_link.name
 DG9-SER DG9 DG9m1 NON-POLYMER SER SERm1 peptide DG9-SER
 DNA-SER . DEL_OP3 DNA/RNA SER SERm1 peptide DNA-SER
 DNA-TYR . DEL_OP3 DNA/RNA TYR TYRmod5 peptide DNA-TYR
-SS . CYS-SS peptide . CYS-SS peptide SS-bridge
 disulf CYS CYS-SS peptide CYS CYS-SS peptide SS-bridge
 CYS-MPR CYS CYS-SS peptide MPR MPRm1 NON-POLYMER SS-bridge
 TRANS . DEL-OXT peptide . DEL-HN1 peptide TRANS
@@ -36768,47 +36767,6 @@ _chem_link_chir.atom_id_3
 _chem_link_chir.volume_sign
 DNA-TYR 1 P 1 "O5'" 2 OH 1 OP2 both
 
-data_link_SS
-loop_
-_chem_link_bond.link_id
-_chem_link_bond.atom_1_comp_id
-_chem_link_bond.atom_id_1
-_chem_link_bond.atom_2_comp_id
-_chem_link_bond.atom_id_2
-_chem_link_bond.type
-_chem_link_bond.value_dist
-_chem_link_bond.value_dist_esd
-SS 1 SG 2 SG single 2.031 .020
-
-loop_
-_chem_link_angle.link_id
-_chem_link_angle.atom_1_comp_id
-_chem_link_angle.atom_id_1
-_chem_link_angle.atom_2_comp_id
-_chem_link_angle.atom_id_2
-_chem_link_angle.atom_3_comp_id
-_chem_link_angle.atom_id_3
-_chem_link_angle.value_angle
-_chem_link_angle.value_angle_esd
-SS 1 CB 1 SG 2 SG 103.800 1.800
-SS 1 SG 2 SG 2 CB 103.800 1.800
-
-loop_
-_chem_link_tor.link_id
-_chem_link_tor.id
-_chem_link_tor.atom_1_comp_id
-_chem_link_tor.atom_id_1
-_chem_link_tor.atom_2_comp_id
-_chem_link_tor.atom_id_2
-_chem_link_tor.atom_3_comp_id
-_chem_link_tor.atom_id_3
-_chem_link_tor.atom_4_comp_id
-_chem_link_tor.atom_id_4
-_chem_link_tor.value_angle
-_chem_link_tor.value_angle_esd
-_chem_link_tor.period
-SS ss 1 CB 1 SG 2 SG 2 CB 90.00 10.0 2
-
 data_link_disulf
 loop_
 _chem_link_bond.link_id