Cefprozil Monohydrate EP Impurity K

Chemical Name: mixture of 4 diastereoisomers of (3RS,6RS)-3-[(2R,5R)-5-ethyl-7-oxo-1,2,5,7-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-yl]-6-(4-hydroxyphenyl)piperazine-2,5-dione (as per EP)

Smile: [H]C(C(N1)=O)([C@]2([H])NC3=C([C@@]([H])(CC)OC3=O)CS2)NC(C1([H])C4=CC=C(O)C=C4)=O