diff --git a/packages/ketcher-core/src/application/editor/data/monomers.ket b/packages/ketcher-core/src/application/editor/data/monomers.ket
index 401d3ff52a..5e069c4805 100644
--- a/packages/ketcher-core/src/application/editor/data/monomers.ket
+++ b/packages/ketcher-core/src/application/editor/data/monomers.ket
@@ -166285,56 +166285,56 @@
       {
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       {
         "label": "O",
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           0
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       {
         "label": "N",
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       {
         "label": "O",
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       {
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       {
         "label": "C",
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       {
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