definiens: shall mean : ( i ) the wa ter - soluble prodrug ( 6R,7R)-7-((Z)-2-(ethoxyimino-2-[5-(phosphonoamino ) -1,2,4 - thiadiazol-3 - yl ] acetyl)amino)-3-[4-(1 - methyl-4 - pyridino)-1,3 - thiazo l-2 - yl]thio-8 - oxo-5 - thia-1 - azabicyclo[4.2.0]oct-2 - ene-2 - carboxylate ace tic acid solvate and coded by TAKEDA internally as TAK-599, or ( ii ) the semisynthesized cephalosporin compound coded by TAKEDA internally a s T-91825