15686-71-2 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-((aminophenylacetyl)amino)-3-methyl-8-oxo-, dihydrate, (6R-(6alpha,7beta(R*)))- 66905-57-5 Cephalexin dihydrate