YLF ylf N-[(1'S,3aS,5R,15S,17S,19Z,21R,21aR)-6'-chloro-20-fluoro-21-{[(5S,9aS)-hexahydropyrazino[2,1-c][1,4]oxazin-8(1H)-yl]methyl}-21-methoxy-17-methyl-13,15-dioxo-2,3,3',3a,4,4',13,16,17,18,21,21a-dodecahydro-2'H,6H,8H-15lambda~6~-spiro[10,12-(ethanediylidene)-15lambda~6~-furo[3,2-i][1,4]oxazepino[3,4-f][1,2,7]thiadiazacyclohexadecine-7,1'-naphthalen]-15-yl]-3-methoxy-1-methyl-1H-pyrazole-4-carboxamide YLF