The pteridine-6 (5H)-thione 1 and various pteridine-7 (8H)-thiones (13, 22, 26) have been synthesized, and their photochemical reactivity has been investigated under aerobic conditions. The formation of different photooxidation products is pH-dependent. In acidic to
![7-[(1,3-dimethyl-2,4-dioxopteridin-7-yl)disulfanyl]-1,3-dimethylpteridine-2,4-dione Structure](https://image.chemsrc.com/caspic/471/79264-82-7.png)
