A fraction of vegetable melanin, consisting of monomeric units of vegetable flavonoids, especially of catechins and leucoanthocyanidins, having a summary empirical formula of the H-form C34-59O14-23H32-44N6-8n, where n6 to 8, molecular weight. Resist compositions comprising the polymers are sensitive to high-energy radiation, have a high resolution, and lend themselves to micropatterning with electron beams or deep-UV rays. dichloropentafluoropropane including HCFC-225ca and at the same time to produce simply and economically 2,3,3,3-tetrafluoropropene from 1-chloro-2,3,3,3-tetrafluoropropane. The basal boom is pivotable relative to the support arm about a horizontal axis. The composite imaging system further includes a second imaging system arranged substantially anterior to the first imaging system. The products utilize a biomembrane permeable organosulfur compound that can redox cycle between thiol, disulfide, and thiosulfinate forms in response to oxidants and antioxidants inside and outside of cells.