diff --git a/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/index.tsx b/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/index.tsx
index 280eceea1c..fb678e6284 100644
--- a/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/index.tsx
+++ b/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/index.tsx
@@ -21,8 +21,11 @@ import { useMemo } from 'react';
 import { selectShowPreview } from 'state/common';
 import { preview as previewConstants } from '../../../constants';
 import { Container, MonomerName, StyledStructRender } from './styles';
+import { MonomerWithIDTAliasesPreviewProps } from './types';
 
-const MonomerWithIDTAliasesPreview = () => {
+const MonomerWithIDTAliasesPreview = ({
+  className,
+}: MonomerWithIDTAliasesPreviewProps) => {
   const preview = useAppSelector(selectShowPreview);
   const ContainerDynamic = useMemo(
     () => styled(Container)`
@@ -39,7 +42,10 @@ const MonomerWithIDTAliasesPreview = () => {
 
   return (
     preview.monomer && (
-      <ContainerDynamic data-testid="polymer-library-preview">
+      <ContainerDynamic
+        className={className}
+        data-testid="polymer-library-preview"
+      >
         <MonomerName>{preview.monomer.struct.name}</MonomerName>
         <StyledStructRender struct={preview.monomer.struct} />
         {idtAliases && <IDTAliases aliases={idtAliases}></IDTAliases>}
diff --git a/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/types.ts b/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/types.ts
new file mode 100644
index 0000000000..c523d7eb48
--- /dev/null
+++ b/packages/ketcher-macromolecules/src/components/shared/MonomerWithIDTAliasesPreview/types.ts
@@ -0,0 +1,19 @@
+/****************************************************************************
+ * Copyright 2021 EPAM Systems
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ***************************************************************************/
+
+export interface MonomerWithIDTAliasesPreviewProps {
+  readonly className: string;
+}
diff --git a/packages/ketcher-macromolecules/src/components/shared/Preview/index.tsx b/packages/ketcher-macromolecules/src/components/shared/Preview/index.tsx
index 70692a411c..139d4d17d7 100644
--- a/packages/ketcher-macromolecules/src/components/shared/Preview/index.tsx
+++ b/packages/ketcher-macromolecules/src/components/shared/Preview/index.tsx
@@ -35,7 +35,7 @@ export const Preview = () => {
   ]);
   const monomerClass = preview?.monomer?.props.MonomerClass;
   if (ketMonomerWithIDTAliasesClassSet.has(monomerClass)) {
-    return <MonomerWithIDTAliasesPreview />;
+    return <MonomerWithIDTAliasesPreview className="polymer-library-preview" />;
   }
 
   return <MonomerPreview className="polymer-library-preview" />;