Alkali and alkaline earth complexation to derivatives of salicylic acid: [Calcium(p-aminosalicylate)(acetate)(H2O)] (H2O), magnesium(salicylate)2(H2O)4, magnesium(p-aminosalicylate)2(H2O)4, magnesium(2, 6-pyridinedicarboxylate)-(H2O)3(H2O)2 and sodium(p-aminosalicylate)(H2O)2