A (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone written confirmation ((1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone WC) is an official document issued by a regulatory agency to a (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone manufacturer, verifying that the manufacturing facility of a (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone active pharmaceutical ingredient (API) adheres to the Good Manufacturing Practices (GMP) regulations of the importing country. When exporting (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone APIs or (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone finished pharmaceutical products to another nation, regulatory agencies frequently require a (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone WC (written confirmation) as part of the regulatory process.
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