Amoxicillin EP Impurity K

(2R,4S)-2-[1-[[2-amino-2-(4-hydroxyphenyl)acetyl]amino]-2-[[2-[[(R)-carboxy-[(2R,4S)-4-carboxy-5,5-dimethyl-1,3-thiazolidin-2-yl]methyl]amino]-1-(4-hydroxyphenyl)-2-oxoethyl]amino]-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid,Amoxicillin Impurity