These compounds derive from members of the form-class Deuteromycotina.  
These compounds derive from members of the form-class Deuteromycotina.  Like the cephalosporins, they have a beta-lactam ring which interferes with the final step in the assembly of bacterial cell walls by inhibiting the enzyme transpeptidase.  For ten points, name these mold-derived compounds whose antibiotic properties were discovered in 1928 by Alexander Fleming.
These compounds derive from members of the form-class Deuteromycotina.  
penicillins