3,3-Bis(3,5-dibromo-4-hydroxy-2-methylphenyl)benzo[c]1,2-oxathiolene-1,1-dione 76-60-8 AIDS-030025 AIDS030025 BCG Baciilus Calmette Guerin Vaccine Bacillus Calmette-Guerin Bromcresol Green Bromocresol green NSC7817