15658-35-2 3-Pyridinecarboxylic acid, 6,6'-dithiobis- 6,6'-Dithiodinicotinic acid 6,6'-Dithionicotinic acid 6,6-Dithiodinicotinic acid CPDS Carboxypyridine disulfide NSC147758 Nicotinic acid, 6,6'-dithiodi-