(S)-2-amino-7'-(pyridin-3-yl)-5H-spiro[oxazole-4,9'-xanthen]-2'-ol

(R)-2-amino-2'-bromo-5H-spiro[oxazole-4,9'-xanthen]-7'-ol

(S)-2'-(2-fluoro-2-methylpropoxy)-7'-(pyrimidin-5-yl)-5H-spiro[oxazole-4,9'-xanthen]-2-amine

2'-(2-methylpropoxy)-7'-(5-pyrimidinyl)spiro[1,3-oxazole-4,9'-xanthen]-2-amine

(S)-2'-(cyclohexylmethoxy)-7'-(pyrimidin-5-yl)-5H-spiro[oxazole-4,9'-xanthen]-2-amine