(6R-trans)-7-Amino-8-oxo-3-(((1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-1,2,4-triazin-3-yl)thio)methyl)-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid 58909-56-1 EINECS 261-491-7