tert-butyl N-[[4-[2-[4-(1,3-benzothiazole-2-carbonyl)-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl]ethoxy]phenyl]methyl]-N-[2-hydroxy-2-(4-hydroxy-2-oxo-3H-1,3-benzothiazol-7-yl)ethyl]carbamate