The invention relates to heterosubstituted N-thiolated beta-lactams, compositions comprising these compounds, methods for their production, and methods of use as antibiotics to inhibit the growth of bacteria. The system includes a dunnage forming machine having a work station for inflating and sealing plastic pouches to form dunnage units. The annealing step is conducted by changing and adjusting the cross sectional shape of the laser light to a prescribed region.