ALEXANDRIA, Va., July 16 -- United States Patent no. 12,358,921, issued on July 15, was assigned to Enanta Pharmaceuticals Inc. (Watertown, Mass.).

"Antiviral heterocyclic compounds" was invented by Adam Szymaniak (Boston), Robert Leon (Sharon, Mass.), Kevin McGrath (Brighton, Mass.), Xiben Li (Lexington, Mass.), Tyler J. Mann (Brighton, Mass.), Jianming Yu (Plainsboro, N.J.), In Jong Kim (Lexington, Mass.), Scott Mitchell (Woburn, Mass.) and Yat Sun Or (Waltham, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention discloses compounds of Formula (I), and pharmaceutically acceptable salts, esters, or prodrugs thereof:which inhibit Human Respiratory Syncytial Virus (HRSV) or Human Metapne...