Error: Could not fetch URL - HTTPSConnectionPool(host='web.archive.org', port=443): Max retries exceeded with url: /web/20210628070418/https://estudogeral.sib.uc.pt/bitstream/10316/12872/1/Synthesis%20and%20Cytotoxic%20Profile.pdf (Caused by NewConnectionError("HTTPSConnection(host='web.archive.org', port=443): Failed to establish a new connection: [Errno 111] Connection refused"))