1 52B (2s)-6,8-dichloro-2-(trifluoromethyl)-2h-chromene-3-carboxylic acid 1.000 2 D72 (2r)-6,8-dichloro-7-(2-methylpropoxy)-2-(trifluoromethyl)-2h-chromene-3-carboxylic acid 0.792 3 416 (2s)-7-tert-butyl-6-chloro-2-(trifluoromethyl)-2h-chromene-3-carboxylic acid 0.783