(S)-8-(2-(7-bromo-9,9-difluoro-9H-fluoren-2-yl)-2-oxoethyl) 7-tert-butyl 1,4-dioxa-7-azaspiro[4.4]nonane-7,8-dicarboxylate

(S)-8-(5-(7-bromo-9,9-difluoro-9H-fluoren-2-yl)-1H-imidazol-2-yl)-1,4-dioxa-7-azaspiro[4.4]nonane

methyl ((S)-1-((S)-8-(5-(7-bromo-9,9-difluoro-9H-fluoren-2-yl)-1H-imidazol-2-yl)-1,4-dioxa-7-azaspiro[4.4]nonan-7-yl)-3-methyl-1-oxobutan-2-yl)carbamate

(S)-7-(tert-butoxycarbonyl)-1,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylic acid