(S)-7-(2- fluoropyridin-3 -yl)-3-methoxy-2',6'-dihydrospiro[chromeno[2,3-c]pyridine-5,3 '-[1,4]oxazin]-5'-amine

(S)-N-(7-(2-fluoropyridin-3-yl)-3-(neopentyloxy)-2'H,6'H-spiro[chromeno[2,3-c]pyridine-5,3'-[1,4]oxazin]-5'-yl)formamide

(S)-7-(4,4-difluoropiperidin-1-yl)-3-(neopentyloxy)-2',6'-dihydrospiro[chromeno[2,3-c]pyridine-5,3'-[1,4]oxazin]-5'-amine

(S)-5'-amino-7-bromo-2',6'-dihydrospiro[chromeno[2,3-c]pyridine-5,3'-[1,4]oxazin]-3-ol