(S)-tert-Butyl 2-(6-chloro-8-methoxy-2-oxo-1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-3-yl)acetate 5g

(S)-tert-Butyl 2-(6-chloro-8-methoxy-2-oxo-1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-3-yl)acetate 5g