10-methyl-10H-phenothiazine-3-carboxylic acid 10H-phenothiazine-3-carboxylic acid, 10-methyl- InChI=1/C14H11NO2S/c1-15-10-4-2-3-5-12(10)18-13-8-9(14(16)17)6-7-11(13)15/h2-8H,1H3,(H,16,17