On February 17, 1976, U.S. Patent No. 3,939,151 issued to Thomas Sheehan for Displacement of the Thiazolidine Ring in Penicillin with the Formation of a Biologically Active Cephem System — a synthetic Penicillin.
HDP Patents Blog
On February 17, 1976, U.S. Patent No. 3,939,151 issued to Thomas Sheehan for Displacement of the Thiazolidine Ring in Penicillin with the Formation of a Biologically Active Cephem System — a synthetic Penicillin.