Amoxicillin Trimer; (2R)-(2R)-2-(4-Hydroxyphenyl)glycyl-(2R)-2-[(2R,4S)-4-carboxy-5,5-dimethyl-2-thiazolidinyl]glycyl-(2R)-2-(4-hydroxyphenyl)glycyl-(2R)-2-[(2R,4S)-4-carboxy-5,5-dimethyl-2-thiazolidinyl]glycyl-N-[(2S,5R,6R)-2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-6-yl]-2-(4-hydroxyphenyl)glycinamide;[2(2R-trans),4(2R-trans),5[2S-(2α,5α,6β)]]-D-2-(4-Hydroxyphenyl)glycyl-L-2-(4-carboxy-5,5-dimethyl-2-thiazolidinyl)glycyl-D-2-(4-hydroxyphenyl)glycyl-L-2-(4-carboxy-5,5-dimethyl-2-thiazolidinyl)glycyl-N-(2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-6-yl)-D-2-(4-hydroxyphenyl)gly;Amoxicillin Open ring Trimer Impurity