1-Piperazineacetic acid, 4-(((6''R,7''S)-7''-methoxy-3''-methyl-5,'',5''-dioxido-8''-oxodispiro(cyclopentane-1,1'-cyclopropane-2',4''-(5)thia(1)azabicyclo(4.2.0)oct(2)en)-2''-yl)carbonyl)-, sodium salt 217199-33-2 SYN 1390 Syn-1390