2918: Carboxylic acids w additional oxygen func and their derivatives

291811: Lactic acid, its salts and esters 291812: Tartaric acid 291813: Salts and esters of tartaric acid 291814: Citric acid 291815: Salts and esters of citric acid 291816: Gluconic acid, its salts and esters 291817: Phenylglycolic acid (mandelic acid), its salts and esters 291819: Carboxylic acids with alcohol function only and their derivatives, ne 291821: Salicylic acid and its salts 291822: o-acetylsalicylic acid, its salts and esters 291823: Salicylic acid esters, nes, and their salts 291829: Carboxylic acids with phenol function only and their derivatives, nes 291830: Carboxylic acids w aldehyde o ketone function only & their derivative 291890: Carboxylic acids w additional oxygen functions, nes & their derivativ 2918: Carboxylic acids w additional oxygen func and their derivatives