5-Oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-[[[(difluoromethyl)thio]acetyl]amino]-7-methoxy-3-[[[1-[2-[(1-methyl-1H- tetrazol-5-yl)thio]ethyl]-1H-tetrazol-5-yl]thio]methyl]-8-oxo-, monos