diff --git a/input/kinetics/families/Birad_R_Recombination/groups.py b/input/kinetics/families/Birad_R_Recombination/groups.py
index 10073461f9..e0c8b1f634 100644
--- a/input/kinetics/families/Birad_R_Recombination/groups.py
+++ b/input/kinetics/families/Birad_R_Recombination/groups.py
@@ -1019,3 +1019,20 @@
 """,
 )
 
+forbidden(
+    label = "trioxidanyl",
+    group =
+"""
+multiplicity [2]
+1 *2 O u1 p2 c0 {2,S}
+2 *1 O u0 p2 c0 {1,S} {3,S}
+3    O u0 p2 c0 {2,S} {4,S}
+4    H u0 p0 c0 {3,S}
+""",
+    shortDesc = u"""""",
+    longDesc =
+u"""
+Forbid this species because it decays and gives you [O] + [O]O <=> O2(singlet) + OH
+even if you have forbidden singlet O2 in your mechanism
+""",
+)
diff --git a/input/kinetics/families/R_Recombination/groups.py b/input/kinetics/families/R_Recombination/groups.py
index 57c9859a4c..123e0ef2f7 100644
--- a/input/kinetics/families/R_Recombination/groups.py
+++ b/input/kinetics/families/R_Recombination/groups.py
@@ -2782,3 +2782,21 @@
 
 """,
 )
+
+forbidden(
+    label = "trioxidanyl",
+    group =
+"""
+multiplicity [2]
+1   O u1 p2 c0 {2,S}
+2 * O u0 p2 c0 {1,S} {3,S}
+3 * O u0 p2 c0 {2,S} {4,S}
+4   H u0 p0 c0 {3,S}
+""",
+    shortDesc = u"""""",
+    longDesc =
+u"""
+Forbid this species because it decays and gives you O2 + OH <=> O2(singlet) + OH
+even if you have forbidden singlet O2 in your mechanism
+""",
+)