7-{[(4-Hydroxyphenyl)(5-propyl-6-thioxo-1,3,5-thiadiazinan-3-yl)acetyl]amino}-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid AIDS-016750 AIDS016750 NSC649770