diff --git a/otc_doc_convertor/convertor.py b/otc_doc_convertor/convertor.py
index 177283a7..c58ac075 100644
--- a/otc_doc_convertor/convertor.py
+++ b/otc_doc_convertor/convertor.py
@@ -331,6 +331,8 @@ class OTCDocConvertor:
             r"^([^a-zA-Z0-9\s]{10,})$",
             # OBS special chars - "\$" "\\" etc
             r"^(\\[\$\\bfnrtvu]{1})$",
+            # CES contains: urn:smn:([a-z]|[A-Z]|[0-9]|\\-){1,32}:....
+            r"\s(urn:smn:\(.*)\.",
         ]
         for to_rawize in rawize_strings:
             for p in soup.body.find_all(string=re.compile(to_rawize)):