10-ethyl-10H-phenothiazine-4-carboxylic acid 10H-phenothiazine-4-carboxylic acid, 10-ethyl- InChI=1/C15H13NO2S/c1-2-16-11-7-3-4-9-13(11)19-14-10(15(17)18)6-5-8-12(14)16/h3-9H,2H2,1H3,(H,17,18