Hello fellow editors,

I have found one or more external links on Alantoin that are in need of attention. Please take a moment to review the links I found and correct them on the article if necessary. I found the following problems:

• https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=204 is found to be dead. Recommend adding https://web.archive.org/web/20131213023114/http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=204 to the original URL.
• http://www.chemblink.com/products/97-59-6.htm is found to be dead. Recommend adding https://web.archive.org/web/20161122110508/http://www.chemblink.com/products/97-59-6.htm to the original URL.
• http://babel.hathitrust.org/cgi/pt?id=iau.31858046217174;view=1up;seq=277 is found to be dead. Recommend adding https://web.archive.org/web/20201205023515/http://babel.hathitrust.org/cgi/pt?id=iau.31858046217174;view=1up;seq=277 to the original URL.
• http://babel.hathitrust.org/cgi/pt?id=uva.x002488783;view=1up;seq=297 is found to be dead. Recommend adding https://web.archive.org/web/20240102062908/https://babel.hathitrust.org/cgi/pt?id=uva.x002488783;view=1up;seq=297 to the original URL.
• http://babel.hathitrust.org/cgi/pt?id=umn.31951d00316749c;view=1up;seq=581 is found to be dead. Recommend adding https://web.archive.org/web/20240102160249/https://babel.hathitrust.org/cgi/pt?id=umn.31951d00316749c;view=1up;seq=581 to the original URL.
• http://babel.hathitrust.org/cgi/pt?id=umn.31951d00316749c;view=1up;seq=583 is found to be dead. Recommend adding https://web.archive.org/web/20240102164545/https://babel.hathitrust.org/cgi/pt?id=umn.31951d00316749c;view=1up;seq=583 to the original URL.
• http://babel.hathitrust.org/cgi/pt?id=mdp.39015026322316;view=1up;seq=623 is found to be dead. Recommend adding https://web.archive.org/web/20240102160247/https://babel.hathitrust.org/cgi/pt?id=mdp.39015026322316;view=1up;seq=623 to the original URL.
• http://jpet.aspetjournals.org/cgi/reprint/81/1/1 is found to be dead. Recommend adding https://web.archive.org/web/20090218035355/http://jpet.aspetjournals.org/cgi/reprint/81/1/1 to the original URL.

When you have finished making the appropriate changes, please visit this simple FaQ for additional information to fix any issues with the URLs mentioned above.

This notice will only be made once for these URLs.

Cheers.—InternetArchiveBot (Melaporkan kesalahan) 8 Desember 2025 02.13 (UTC)Balas