120138-50-3 AIDS-060877 AIDS060877 Quinupristin Virginiamycin S1, 4-(4-(dimethylamino)-N-methyl-L-phenylalanine)-5-(5-((1-azabicycl- o(2.2.2)oct-3-ylthio)methyl)-4-oxo-L-2-piperidinecarboxylic acid)-, (S)-