9-hydroxy-2-((1S,3R)-3-hydroxycyclopentyl)-1,8-dioxo-N-(2,4,6-trifluorobenzyl)-2,8-dihydro-1H-pyrido[1,2-a]pyrazine-7-carboxamide,9-hydroxy-2-((1S,3R)-3-hydroxycyclopentyl)-1,8-dioxo-N-(2,4,6-trifluorobenzyl)-2,8-dihydro-1H-pyrido[1,2-a]pyrazine-7-carboxamide,Bictegravir Impurity