(7aR,7R)-7-({2-[(difluoromethyl)sulfanyl]acetyl}amino)-3-[({1-[5-(dihydroxymethyl)-10,10-difluoro-5-methoxy-4,7-dioxo-6-aza-3-oxa-9-thiadec-1-yl]-1,2,3,4-tetraazol-5-yl}sulfanyl)methyl]-7-methoxy-6-oxo-2,6,7,7a-tetrahydroazeto[2,1-b][1,3]oxazine-4-carboxylic acid