(S)-N-(2,4-difluorobenzyl)-2'-ethyl-9'-hydroxy-1',8'-dioxo-1',2,2',4,4',5,6,8'-octahydrospiro[pyran-3,3'-pyrido[1,2-a]pyrazine]-7'-carboxamide
(S)-N-(2,4-difluorobenzyl)-2'-ethyl-9'-hydroxy-1',8'-dioxo-1',2,2',4,4',5,6,8'-octahydrospiro[pyran-3,3'-pyrido[1,2-a]pyrazine]-7'-carboxamide