... 7,8-benzo-2H-chromene (7,8-DMBC), and 2,2-dimethyl-5,6-benzo-2H-chromene (5,6-DMBC) were synthesized according to ... (17) with Escherichia coli strain C-1A carrying ... Pyrex in a 100 μL quartz cuvette by use of a hand-held UV lamp (Mineralight lamp, model UVG-11, 115 V ...