Amoxicillin trihydrate powder (amoxicillin trihydrate usp powder) - amoxicillin and their salts. antibiotics. - chemical name: (2s, 5r, 6r) -6-yy (2r) -2-amino-2- (4-hydroxyphenyl) acetylamino -3,3-dimethyl-7-oxo-4-thia-1- azabiciclo�3.2.0 heptane-2-carboxylic acid t