What is Benzylpenicillin Impurity 2 (CAS: 103-81-1)?

Benzylpenicillin Impurity 2, with the CAS number 103-81-1, is a known impurity associated with benzylpenicillin, a type of penicillin antibiotic. It is typically identified as 2-(2-furyl)-2-methylpropionic acid and is characterized by its structural similarity to the parent antibiotic. This compound is often found in trace amounts during the synthesis or degradation of benzylpenicillin and may impact the purity and efficacy of the final drug product.