78110-38-0 AIDS-013397 AIDS013397 Azactam Aztreonam NSC646279 Primbactam [2S-[2alpha,3beta(Z)]]-2-[[[1-(2-Amino-4-thiazolyl)-2-[(2-methyl-4-oxo-1-sulfo-3-azetidinyl)amino]-2-oxoethylidene]amino]oxy]-2-methylpropanoic acid