5-[1-[tert-butyl(dimethyl)silyl]oxy-2-[2-[2-chloro-3-[[4-(2-propan-2-yl-1,3-thiazole-4-carbonyl)-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl]methyl]phenyl]ethylamino]ethyl]-8-hydroxy-1H-quinolin-2-one