155213-67-5 2,4,7,12-Tetraazatridecan-13-oic acid, 10-hydroxy-2-methyl-5-(1-methylethyl)-1-[2-(1-methylethyl)-4-thiazolyl]-3,6-dioxo-8,11-bis(phenylmethyl)-, 5-thiazolylmethyl ester, [5S-(5R*,8R*,10R*,11R*)]- A-84538 ABT-538 ABT538 AIDS-028478 AIDS028478 Component of Kaletra NSC693184 Norvir (TM) RTV Ritonavir