PHYSICAL CHEMISTRY Mol. wt. 414.4 M.f. C14H18N6O7S Form Colourless crystals. M.p. 177.8-179.5 V.p. 4.2 ?10-5 mPa (25 ) KOW logP = 3.16 (hplc method) S.g./density 1.46 (20 ) Solubility In water 9.76 mg/l (20 ). In methanol 4.32, hexane 0.0185, benzene 15.6, 200, acetone 33.7 (all in g/l, 20 ). Stability Stable at 50 for 6 months. Relatively stable at pH 7. Unstable in acidic or alkaline media. pKa 3.7
