1-Azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-((2-(acetylamino)ethenyl)thio)-6-(1-methylethyl)-7-oxo-, (5R-cis)- 1-Azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-((2-(acetylamino)ethyl)thio)-6-(1-methylethyl)-7-oxo-, (5R-cis)- 72615-19-1 Antibiotic PS 6 Antibiotic PS6 PS 6