. . . . . . . . "The PubChem Compound identifier (CID) Persistence Policy describs how the PubChem CIDs are made persistent, meaning they do not change over time. Once a CID is assigned to a structure, it remains associated with that structure indefinitely within the PubChem database." . "PubChemCID_Persistence | PubChem Compound ID Persistence Policy" . . "30"^^ . . . "RSA" . "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCoKFb7LKlXyBB7BUvjFF9bDJNk0WxH3Xerr4H3v/VCiRVshEDl3BZVekbMMmdRe+TOPyc8AOLd9IAL2VfVVD/T0rmCHk7Pw7DQjI96mwyeXhE7f4g0WG5UT5Pxxm0Rzy7IrYnEaaVDs7dkZUt952M6qWlHfTwCQDcXJhZfLiXoMwIDAQAB" . "EqpJJ0NKXv9RaqGKfSOh4fF9hWI+m2GsEyIPTkFGUsnDxuRcNgjtobvDhFugXUto14RBkLuDVd3+8luff2iokOt4jnpcKXewjDB/71rkIr1AYdw7WCDoCdZm9w+qDAjeXLmsQOoA9GFAHd0qu/3y5OYGUtdANwrMB5CwZ/xARZA=" . . "2025-06-29T19:32:28Z"^^ . . . . .