(2R-(2alpha,3Z,5alpha))-3-(2-Hydroxyethylidene)-7-oxo-4-oxa-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, compound with tert-butylamine (1:1);(2R,3Z,5R)-3-(2-hydroxyethylidene)-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylic acid - 2-methylpropan-2-amine (1:1)
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