STS in tablets mg mL^{−1} | Pure STS added mg mL^{−1} | Total found mg mL^{−1} | Pure STS recovered* Percent ± SD | STS in tablets µg mL^{−1} | Pure STS added µg mL^{−1} | Total found µg mL^{−1} | Pure STS recovered* Percent ± SD | STS in tablets µg mL^{−1} | Pure STS added µg mL^{−1} | Total found µg mL^{−1} | Pure STS recovered* Percent ± SD |