20520-34-7 | sodium 3,3-dimethyl-7-oxo-6-[(3,4,5-trimethoxybenzoyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate | C18H22 N2 O7 S . Na |
20520-33-6 | 3,3-Dimethyl-6-((2,2-dimethyl-1-oxopropyl)amino)-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid monosodium salt | C13H19N2NaO4S |