(2S,11E)-6,7-difluoro-17-hydroxy-2-(2-methylphenyl)spiro[9-oxa-1,14,21-triazatetracyclo[12.7.1.03,8.016,21]docosa-3(8),4,6,11,16,19-hexaene-13,1'-cyclobutane]-15,18-dione;(2R,11E)-6,7-difluoro-17-hydroxy-2-(2-methylphenyl)spiro[9-oxa-1,14,21-triazatetracyclo[12.7.1.03,8.016,21]docosa-3(8),4,6,11,16,19-hexaene-13,1'-cyclobutane]-15,18-dione