3-Methyl-8-oxo-7-[2-phenyl-2-(5-propyl-6-thioxo-[1,3,5]thiadiazinan-3-yl)-ethanoylamino]-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid AIDS-016752 AIDS016752 NSC649772