D-threo-Pentitol,1-amino-2,5-anhydro-3-S-[2-carboxy-6-(1-hydroxyethyl)-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-en-3-yl]-1,4-dideoxy-3-thio-,[4R-[4a,5b,6b(R*)]]-; CL 191121
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