Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'N(2)-[(R)-2-amino-2-(4-hydroxyphenyl)acetyl]-N-butyl-L-serinamide'?

A. A dipeptide consisting of N-butyl-L-serinamide having an (R)-2-amino-2-(4-hydroxyphenyl)acetyl residue attached to its alpha-amino nitrogen. A synthetic determinant of cefadroxil, it is a promising tool for determining in vitro cross-reactivity to cefadroxil in amoxicillin-allergic patients.
B. A dipeptide composed of L-glutamic acid and L-tyrosine joined by a peptide linkage.
C. A dipeptide formed from D-alanine and L-leucine residues.
D. A dipeptide formed from L-leucine and L-aspartic acid residues.

Answer: A dipeptide consisting of N-butyl-L-serinamide having an (R)-2-amino-2-(4-hydroxyphenyl)acetyl residue attached to its alpha-amino nitrogen. A synthetic determinant of cefadroxil, it is a promising tool for determining in vitro cross-reactivity to cefadroxil in amoxicillin-allergic patients.